Here is a link to a tool that can help you find the rough amounts of glutamate (also glutamic acid and glutamine) in foods. (The body typically can convert glutamate into these substances when it does not need glutamate to function at that moment and transfer it back into glutamine etc when it does not-- but in my case somehow this "shut off switch" is not working properly). I am severely simplifying this process and I am not an expert in this! This is very complicated stuff.

I have printed out a list for each food group and studied it so that I can gauge my glutamate intake a little better. You'll notice that the meats and cheeses and fermented veggies are at the highest levels. If you need to remain on a high protein diet, perhaps there is a way to choose high protein foods with lower levels of glutamate? Also, maybe take a look at how often you consume foods that are cooked for long periods, especially tomato sauces and slow cooked meats? Fermented veggies? Broths? Just thoughts and certainly something to ask a professional about!!

Here is the tool:
https://tools.myfooddata.com/nutrient-ranking-tool/glutamic-acid/fish/highest
I too had been keeping on a high protein food diet because I did not want muscle wasting when I could not walk well (but it is hard not to have muscle wasting when you cannot move as you like). I was not choosing lower glutamate proteins and I think that was the biggest part of my problem. So, I continue to explore and expand my diet as much as I can. I hope this chart/tool helps. Maybe bring printouts to a dietician? I wish you all the best!