Wel you should try and do this but you should also work on your speech. I use Lee Lovett’s methods and practice reading aloud everyday. But since taking the program my mental health (like ur describing) has really improved by saying “ok so what if I block every now and then, I accept it will happen sometimes. But I will also do all I can to help my speech at the same time.” A block is new information on how you could have avoided it with Lee’s methods so now everytime I block I go into despair for like 2 minutes and then hyper analyze where I could have used a technique to avoid the block. Anyways you should try his program you literally have nothing to lose and pretend hypothetically you come out completely fluent you know how much people would admire that accomplishment of hard work? Just my opinion hope it helps a bit.