I agree with what the others have said. I'm not the same person who I was before I got sick. My first stay in hospital was in 2010 and I really can't say if it was the medication or the life experiences since, that have changed me into the person I am now. I'm very grateful for everything I've been through, I think I'm much more in touch of how I'm feeling now. This has meant that I'm a lot more empathetic to those around me. I notice people more now. I also notice when people are feeling 'off' and I can start a conversation with them now.
Of course you will feel nervous that the old you seems to be gone, but the new you might be an improved you.
The past is history, tomorrow is a mystery, today is a gift, that's why it's called the present.
Try to live more in the now, tomorrow is promised to no one.