Get a blood work up done, see a doctor. It maybe thyroid or something else. Anything concerning your heart it is necessary to see a doctor.
quick update if others decide to comment .. my ringing is the same but my body is reducing its depth of how bad im sweating im still wide awake and not hungry. After lookign around on the net it mostly seems to be anxiety ..But i have constant ringing still and cold spots on my body regardless. Has anyone taken anything that helps with either ringing of the ears or somethign that calms you down prior to sleep because these incodents only seem to happen in the fall to winter and i awake thsi way never sleep that way. When i was 16 i use to have breathing/heartbeat anxiety(no ringing or coldness) and i overcame that mentally but this is one that attacks me in my sleep.
Waking up with my heart pounding. my eyes are bloodshot and i have no insurance i know your responce is probably to go visit a doctor which i cant till i get another job or get under my girlfriends insurance by moving in. Both will take time.. i was wonderinf if theres any way to help till then.