Hello Aladdin,
like you i had troubles with ED with my GF in bed and like you i got anxious before we had sex. There are things you both could try.
To relieve the pressure of "performing" as a man it's helpful to turn sex into something different, like Karezza (google it) and elements of Taoism. This is when you have sex but the man would not O at no point, because the semen is a precious thing. The idea behind my advice is to eliminate the pressure of performing as a man and to learn a new way of intimacy with your wife. Like touching each other, kissing and maybe she can have fun and that's absolutely okay. If you work good - fine - if not, then it's no problem, because sex shouldn't be that orgasm-focused like a lot of guys think it is. Learning that sex is a thing one can have without Oing was a great stress relieve for me.
In my journal i wrote down some kind of diet that can help you improve your blood flow and libido. Just look it up and maybe it's helpful for you.
Another advice, try to create a nice atmosphere in bed. Like being more joyful and funny to improve positiveness in bed.
Do not let the frustration near you - it will pass one day. This day can be far in the future or close, no one can say this.
take care
Imsor