Shansy
There is no reason that it should be a struggle for the rest of your life although it will always be in the background ready to leap out again. It is in your memory now and you can not get rid of that but you can cover it up making it less effective. The object of CBT is to do just that and can totally neutralize the negative effects in your memory and in effect allow you to live a normal life. But it takes work. It takes time to bury the negative thoughts enough so that they are not easily accessed. In the mean time this program will give you the tools to deal with the excess anxiety and panic that still happens. CBT has a very good record of working and the program is based on it.
On the other hand, your fiancee does not realize the damage he is doing by reminding you of how you are. That only brings it to the forefront of your memory covering up any positive thoughts you have there. Together you need to celebrate every small achievement you have and they will get bigger and better. Much better.
In the mean time you need coping skills and relaxation skills. The latter stops the cycling of the anxiety and the former keeps negative thought from building up in your memory where it is too accessible.
This is not as complicated as it seems.
Grandmothers used to preach "never go to bed mad" I extend this to say never end a conversation on a similar note. Try to find something positive even if all it is is that. "I am trying and I will get better". This will sit on top of the painful negative thoughts or actions and make them less accessible to future thought. And thought is where the trouble starts.
No one but me and other past and present sufferers can understand what you go through. Those who don't suffer have no idea how lucky they are. But they think they are the ones suffering. Not so. There anger keeps them safe.
How do you make him understand? You can't, he has to share your journey without interfering. He has to learn and share without making suggestions. Suggestions from non sufferers are seldom effective.
My partner is a fellow sufferer (past) so we understand each other fairly well except that my triggers are different from hers. Life is not perfect (it never is for anyone) but it is better than it was before CBT. Much better. You can do this and we are here to support you. You can start by using us. Just writing here will help a lot more than you think.
Davit.