I know exactly how you feel. I have had long haulers for over 1 year now. The cough can be quite painful & upsetting. My primary care giver ordered Montelukast 10 mg 1/day for that cough and/or sore lungs. It seems to help. He also gives me prednisone & Vit D, & I give my self Vit B's in a shot. The latest & greatest is a drug called naloxone in low doses. My doc couldn't get it for me, so I order it online without a problem. It's not cheap but seems the only way I could receive this medication. I was referred to a covid care center, but i still have 3 more months of waiting before they can get me in. Even then, you are made to see a neurologist, auto immune doc & a ear, nose, throat specialist. So I am just going to 3 referred doctors from my primary care giver. Hopefully I can be seen by them locally before 3 months. If you have a family member, they can be a great advocate to take along on your visits. What did the ER do for you? Anything? I've told my self "I can't take this anymore" & thought about going to a hospital. I talk myself out of it! I hope this has helped you even just a little bit.