It makes not the slightest difference as to whether the court order was made "under pressure"... the fact remains that it was made in your favour, your ex- may appeal all he wishes, but any appeal would be against the court decision and not against you personally so stop worrying about that matter. You hold the key, so to speak.
It does seem that you have been badly let down by solictitors acting for you, and if you feel aggrieved in these circumstances you can take your case to the Law Society and complain formally. To do this, I would strongly recommend that you visit your local Citizens' Advice Bureau in the town in which you live. Their advice is always provided free of charge.
Obviously, I do not have access to any of the paperwork involved in this highly complex case that you describe, so the advice I am now passing on to you is given in good faith and I am hopeful that you will be able to take this from there, and be able to make something of your life. You are entitled to something - it is your basic human right.
Try to be as patient as possible with the person who is attempting to represent your interests; I know this may seem extremely difficult with your medical condition, but the people at the Citizens' Sdvice Bureau are trained and competent personnel who are there to assist you and to point you in the right direction at no financial cost to you whatsoever. Be prepared to take along all relevant documentation involved with your case, and I conclude by wishing you the very best of luck with your "fight" for justice.