If you are on meds, you will change. It cant be helped, those meds are very powerful and are directly affecting our brain chemistry.
But you also have to ask yourself if the person you were was who you wanted to be. I was a serial cheater, a thief, a lier, in short a bad person. Yes the new me felt completly wrong and not right. But i stuck it out and like the new me so much better. I dont cheat, i dont lie, i dont steal. It feels good to look in the mirror. Now all that stuff is still inside of me, still there tempting me. But now i have a choice as to weather or not i make the bad choice. Thats awesome for me, i get a real choice, be good or be bad.
But it took a while to learn who this new bill was and what he had to offer. I lost some things but gained others. In the end i am much better now than what i was three years ago.
It does get better in time. If you remember the Yin and Yang wheel, just when yin is approaching its zenith, yang is allready moving to replace it. You are lost now, but you will soon find yourself again. And then you will have to decide if you want to be the new person you are now.
Good luck Bill