Hi everyone, I'm hashimoto's so underactive and taking thyroxine 125m and have been on these meds for about 10years. I have terrible trouble with thick mucose and a cough with really bad spasms, almost vomit. It's driving me mad as I do some presentations in public. Dread having a bad coughing spasm while talking. Eating so many cough sweets, probably have no teeth left soon. GP says post nasal drip, given me nasal spray, not terrible effective. saw these Serrapeptase recommended on internet for just this problem. But worried about taking them in case of side effects. GP not terribly helpful thinks herbal stuff quack. Anybody any ideas?