The past 6 weeks i have been woken up from sleep by coughing and feeling like i was choking 3x. i have no pain, no burning, no metallic taste. ?

Snoring?: If you sleep with someone else, ask them if you have recently begun snoring at night? If so, that may make you feel like you're choking. Also, have you gained weight lately? That may also be a factor. Lastly, you may be getting sick, and/or have a sub-clinical infection only manifesting at night in the form of a sore throat.

Post nasal drip: You may have a post nasal drip use saline nose drops before going to bed or take an antihistamine before bed time. You ca also use a vaporizer and sleep on several pillows or elevate your mattress.