Go to a nutrionist who knows what s/he is talking about. Your problem may not be protein, but something like b-12, or something else altogether.
Guessing and asking internet mavens for advice will not help.
Jack Norris is an RD and a cofounder of Vegan Outreach. He answers his email. I'm sure he can recommend a nutrionist in your area to get you back on track:
Vegan Health.org : Home