What Causes Dizziness,breathlessness And Tightness In The Chest?

strange experience yesterday at church. Dizzy, felt like I could not catch enough air, but don t think I was breathing heavily. Tight muscles in legs, arms, back, chest and jaws. Felt slight nausea and as if could lose consciousness. Made it outside and felt like I would feel better if I could stretch the muscles, jog or lift weights.... Finally the issues subsided after about an hour. I have been quite tired for several weeks. Last week experienced a blind spot in vision and could see like lights flashing in a counter clockwise circular motion, mainly left eye.... I am 56 years old, 5 9 190 pounds and was 235 pounds. Lost about 45 pounds a year ago. Quit smoking 3 years ago. Have had high cholesterol and triglycerides. Last check about Jan 2015 cholesterol was 236, triglycerides were 164. BP was 122/84 and weight was 227# at that time. I have been eating more healthy since Jan of 2015, hence the weight loss. Was fairly active until around October last year and became somewhat sedentary again. Any thoughts or suggestions as what to look into?