Can I spend to help my son?

I am caregiver for my husband who is still at home. He has vascular dementia so it's hard to predict the future. He is 82. We have ample money but eventually we may have to depend on medicaid. I am aware of the 5 year rule. Our son was in a serious accident 7 years ago and has to get by on disability which is pitifully low. He has serious medical issues, anxiety and major depression and I am concerned for his life. He lives in an isolated town with inadequate medical help and he cannot sell his house and move. The doctors have him on too many mind altering drugs! No illegal drugs! He has been trying to get into treatment for addiction to prescription drugs but they are too crowded to get into, especially when they take illegal drug addiction cases first. Would we be allowed at this time to pay for a treatment facility for him considering the 5 year rule? Thank you for your help.