When I am in that time of upset, not being here sounds and feels like a solution.... it isn't... what if, after you die by suicide, you find it is much worse and you are going to get to come back and try again.... maybe cutting out the middle part, the suicide, you can find some help with the problem with your mom making things worse... this is very hard... and super proud that you posted instead of just feeling it alone....
If you have PTSD and OCD, that is a hard combination... and sorry she is taking it personal , when you simply need the truth and some support.... but you are much stronger than you think you are... anytime someone posts about wanting to die, what I really read is someone needing relief, not death....
Do you have a therapist??? If so, talk to them about ways to handle this when your mom just doesn't get it... if you don't have a therapist, please check into getting one.... They can help you manage the OCD, which doesn't help ... are you on any medication for it... ?
Sending you gentle hugs, and we hear you.... and are supporting you.