Hello Penny,

 First let me say this is a reply as a non-expert but I hope it may be of some help in suggesting some leads though this rough time.

On reading your 'question post' the first thing I hear loud and clear is that you and your child have apparently removed in crisis from a situation of domestic violence and abuse. Now you are trying very naturally to ensure safety and distance for you both, at present  with friends.

 Sadly your personal situation is of course all too common, and here it sounds you might take advice from Women's safety and shelter organisations, eg to gain some info into your rights/ versus husband's (contact etc) and practical advice to safeguard your situation.

Your husband is obviously intending using the 'unfit mother'  argument, again a very common ploy.

On the question of your medication and what exactly it has been prescribed for over time,I would just say that you should discuss this in honest detail with your new doctor, who hopefully you feel you can trust.You need medical allies too...

 I imagine that Seroquel has helped your symptoms and improved your mental health?

You would know if this is true.....I can only guess here. 

Your husband 'giving you a diagnosis', real or imagined,from  what medicine you take serves is only his purpose to undermine you and your attempt to cope.

Finally , as a general statement,not directed to you personally I must  say that having  bipolar disorder,  schizophrenia  and other related conditions in no way preclude successful parenting. People can be 'well' with these conditions, but stress certainly doen't help, and struggles are harder then.

Good luck 
Chris,(retired doc, non psych)

UK