Advice needed for protein rich foods

Hi everyone! I know about my histamine intolerance for a few years now, pretty much accepted it and was able to cut all the foods that directly contain histamine as it was so helpful to understand why I struggle so much with symptoms connected to eating. I take anti-histaminicum tablets daily (which are very important for me and definitely help). As a vegetarian/vegan I mostly struggle with histamin-liberators and my biggest issue is eating enough protein. I can barely find protein rich foods that work well for me without irritating. Which foods do you eat that are NOT histamin liberators but high in protein? I have to supplement zink, iron, vitamin b12, etc. Constantly and am always low in them anyways since I was a kid which is really frustrating.

I definitely can’t eat: - chickpeas - peas - soy - beans and lentils (just little amounts) - bigger amounts of dairy products - most nut’s especially peanuts, walnuts, cashew, hazelnut) - any meat alrernative that is fermented or highly processe

What works: - pumpkinseed and rice protein powder - some seeds like leinenseeds, chia - Eggs (Not too much though as the egg white triggers histamine being released) - quinoa, amaranth, hirse, oats, wheats - macadamia& paranut - all veggies that have protein but are not histamine liberators

Honestly at this point I am so frustrated I am even considering to go back to eating fish & meat, which I really don’t want to do and haven’t in +10 years but my body really need protein and I feel so limited in the foods I can eat.

I am thankful for any ideas and tips! ⏤͟͟͞͞⏤͟͟͞͞♡