Should I fight to stay in the ARMY, If they want to seperate me for bi polar, and PTSD?

I have been in the Army for 5 years, I have a good record. I am A SGT. im a single mom with 3 year old twin boys. I have been diagnosed with bi-polar disorder and PTSd. the Army says that both are preexsesting to my entering the millitary. since ive been in the ARMY they have giving me a hysterectomy, removing my uterus cervix and fallopin tubes. after that I went into a hea vy depression, that was a year ago. now the army wants to give me an admin seperation, and deny me the bennifits that im owed. should i fight or just let them put me out