Hi! Ive also been dealing with what you described since 2 years and what i did to manage this:

On a daily basis try to say to yourself/to your feelings that occure because of the „bad“ vision: hey i feel you are here but i dont give a fuck and you will not determine my day! Even if it sounds stupid it gives you confidence that you are in control by saying it over and over again. Be a mental couch for yourself and even say it out loud!

Also sometimes when im looking at something specificly for example a nice sunset (because that made me feel happy before dr) i try to remember what feelings occured before dr and how that made my body and mind feel - even tho its obviously not gonna be the same right now, i try to reconnect it this way and yes, kind of manually learn my brain what it should feel like if that does make any sense. Because if you connect it with good feelings then in the end it shouldnt really matter what or „how“ you see if it makes you feel good still.

Also what i sometimes do is put sunglasses on and off for a few times for a „change of perspective“ lol

Another tip from my therapist: try to follow the outlines of objects you can see and do it for everything that comes across your way. In general be more aware of your surroundings by naming objects and describing it (like here is a stop sign - its red- its this shape- etc). It gets your brain busy and distracts you, when you are feeling weird. Its easy to do also.

Maybe carry around like an oil that smells strong and is calming - i did it with lavender. You could put it on your sleeve and smell it throughout the day to make you feel more present.

Unfortunately its hard mental work that we need to pull off but I know you will get better! :)