Stars, I have a friend who had unpleasant/difficult calls from her ex after they split, so she did what others have suggested here - got a new phone for herself, that all her friends/contacts got the new number for, and her ex only knows the old number, so she can turn that phone off and ignore him.
Actually, it might be even easier just to get a new sim card - I know that vodaphone will do a new sim for £5, and I imagine other providers would do something similar, especially if you explained why you needed it. Then you could store all your current contacts (except H) on the phone, so you wouldn't have to enter them all again and send them all a quick text with the new number. Then if you need to talk to H you can just put the old sim back in the phone.
I would also suggest most strongly that you get your solicitor to tell him to stop ringing you and hassling you, and that he should only contact you via your solicitor. Get her to tell him that, until his attitude towards you improves, you will be turning off your phone and deleting any messages without reading/listening to them.
But the most important thing is huge congratulations to you for what you have achieved and how far you have come. My whole family has been waiting to hear the good news, and we are all so proud of you. The dses have found some dvds for your children, if you'd like them - Garfield 2 and Madagascar (and I think there might be others too).
Huge hugs love!