It sounds to me like you have made up your mind that you want to be left alone during the holidays. Becoming a Recluse Many persons with brain injury become reclusive. There are many reasons for this. Avoiding over-stimulation is one of them. Difficulty with initiation and follow-through is another.
Difficulty making new friends and maintaining old relationships is yet another.
Then there's loss of one's work or school life, loss of self-esteem, losses of other kinds. The list is long and varied. I mention this simply to point out that it sounds like you may be heading in this direction. This means dealing with changes, noise, light, family, social contacts, meaningful activities, etc. There are strategies one can learn to deal with these things again.