This is how healthy families do things. Chances are you don't have one of those. In very close, insular sorts of families or already dysfunctional families in particular, members may resist change. Sometimes, if the family balance was difficult to achieve in the first place because one family member is already needy or dominating, family members may be terrified of any change in the status of a family member and simply retreat from reality and refuse to recognize that change is taking place whether they want it to or not. They may blame the person who is sick or who they see as responsible for the change.
- Let things be and hope they come out alright. If you do that, things will likely get worse before they get better unless you have some unusually healthy kinfolk. While you view their lack of support as a betrayal, they may not understand what's happening with you at all. If the problem is mental illness, think about this. They may not fully understand what's happened to you and blame you for acting erratically. If it's grief, loss, illness or disability, the family may simply be overwhelmed by the tragedy and be grieving themselves. Sometimes that grief can cause them to pull away and try to regroup. You can say nothing and let it happen and it may work out. The chances aren't very good, especially if you make a fuss because your loved ones appear to have abandoned you.
- Confront your loved ones and tell them exactly how you feel and expect them to fix it. Sadly, the chances of this working out well are very low. People are flawed creatures and yelling at them or demanding they be better than they are isn't very effective. Waiting on someone else to fix a damaged relationship between you and your family leaves you feeling helpless and your family feeling put upon. You'll need a professional mediator to solve your problem if everybody is waiting for someone else to fix things.
- Change what's going on in your own head. This advice applies particularly to Christians, though some other faiths and philosophies offer some variant of this advice. Being Christian I will defer to what I know. Families are God's microcosm of the human family. When God commanded Adam and Eve to be fruitful and multiply, he was mad at them and wanted them to learn a hard lesson. Families are where we learn to love someone besides ourselves. It's where we learn the practical application of the Golden Rule. Forgive your family and toss aside what you believe they should have done. Believe that they love you and look for a solution, not for someone to blame. It may just be the whole horrible situation that's to blame and not any one person. Ultimately, though, you may have to be the first person to realize and accept that.
Beside, it will help you not to feel helpless anymore.