Well I'm happy to see major improvements, maybe it's not so much the l-glutamine then. could be the probiotic strains. L-glutamine is mixed in and this probiotic recommends 2 doses per day which makes that 1000mg of l-glutamine. That is still very low compared to what you're saying. I doubt they put it in there for nothing.
I find this hmf neuro dose every few days is doing the job but I think I might up it to the recommended amount.
Sounds like you were in rougher shape than I was, so that's good to hear it's working for you at that dose.