I care for my husband with HD. He is 46 and in later-mid-stages. We care for him at home. I have 2 school-aged children who are at risk. My husband was adopted, so we did not have other family members to "show us the ropes" so to speak. I have my own opinions and experiences to tell you about.
1. How aware is someone with HD of their own illness? Are they self-aware or do they try to deny it?
Each person with HD presents differently. Some will have physical symptoms first, some cognitive, or personality changes. It is very common that the person will not be aware of these changes as they are emerging. Anosognosia is a medical term for decreased awareness of your own symptoms. It can be misconstrued as denial, or found together with true denial. In my husband's case, he had little awareness that the reason for losing job after job was likely his poor performance, or that the reason he was getting into road rage arguments and arguments with me and others was because he had a short fuse. Our marital problems were because I knew too well how to push his buttons. Sadly the blame was always on me and the apologies never came. His physical symptoms came later, and were exacerbated when he was drinking. We were separated at the time and he was living with a brother. His family contacted me telling reports of strange walking behaviors, falling and agitation. They asked me to help get him to a medical appointment. I worked at a hospital at the time. The first neurologist he went to (mis)diagnosed him with Tourette's syndrome. Looking back, I realize it is because Rus was only aware of his walking and falling, his verbal tics. Given that he went to the appointment alone, he did not report any of the cognitive limitations or aggressions he was having as an associated symptom. We went together to another neurologist about 4 months later. Given that I was able to report some of the cognitive and behavioral symptoms, this doctor (who was also more experienced with Huntington's) was pretty sure it was HD. He sent Rus for an MRI and the blood test for confirmation. He was diagnosed at age 40 with a CAG count of 43. Looking back, I suspect some of his cognitive and behavioral symptoms were emerging as early as 36, but we never knew to suspect Huntington's, nor did we have family members around to clue us in. I am told by many family members I have met that the family around the person often know they are becoming symptomatic long before the person becomes aware.
2. (From an actors point of view) At what point do they know they have HD? When do they know they are behaving badly for example.
My husband was poorly aware of his bad behavior. He went through a period of time where it was unsafe for him to live with me and the kids because of his aggressions. The police were frequent visitors.
3. What are family members trained to do to care for a person with HD?
Families are trained to whatever degree they are willing to reach out to the HD comminuty and network with other HD families. There are no "programs" or quick guides to caring for a person with HD, although there are some useful publications and networks like the HDLF and HDSA. The neurologist will manage the medication regime, and may have social workers and counselors on staff to help with access to resources. Many people with HD have watched parents or grandparents, aunts, cousins, etc. decline with the disease. A spouse marrying into the family would need to be strong to adapt to the caregiver role, not having grown up with it. I anticipate that my kids will be good caregivers later on because at 10 and 11, they have already watched me in that role, and helping their dad comes naturally to them. The caregiving role tests a marriage more than any other challenge possibly can.
4. How fast is the process from not knowing they have HD to knowing for sure?
The only time you know for sure is if you test positive. There have been many people on this forum who know they are at risk, are noticing tremors, forgetfulness, and other suggestive symptoms and are CONVINCED they have the gene. They test, and the result comes back negative. Stress can play awful tricks on our bodies. It's called symptom hunting. I'll admit that every time my children stumble, or throw a fit, or have difficulty in school I worry if something is "happening" to them.
I'll leave that one for someone else to answer. During my husband's pre-diagnosis period, everyone knew something was wrong with him-except for him.
I hope you get some good answers here. Feel free to PM me if you would like to talk further. Rusty likes to be involved with education and awareness of HD. He would gladly speak to you all as well.
Good luck.
Patty