Well i agree that you have faced some painful incidents in the past, but life never stops, it keeps on moving, so you shall also move on. As far as feeling of disrespect and used is concerned, there is nothing like that. Problem is that we take everything from our near and dear ones in high intensity, the reason probably is expectations. We expect a lot from people on whom we rely, so if that expected things does not happens it leads to disappointment.
My advise to you is:
1. Make yourself busy in anything you like.
2. Join some course or take up some job and if that is also not possible then join some organisation where you can contribute with your efforts.
3. Report to your doctor about anything related to medicines.
4. You can try alternative medicine like Homoeopathy also to help in coming out of this phase.
5. Try to be happy and make others happy.
6. Join some Sport activity or start some exercise like jogging, running, swimming etc. because exercise is the best way to combat bad effects of stress
Wish you a speedy recovery to health