Not Menopause.....?

Here are my symptoms: 51 years old, went through menopause 4 years ago. Get hot flash after lunch only. Comes and goes in about 10 minutes, Then I get EXTREMELY tired, until I get off of work. Also, my vision on the computer gets bad....I can't keep my eyes open and I have that sick tired feeling. I am some overweight, but have started walking to get the extra weight off. Could I be borderline diabetic? Or is there something else going on? I also have horrible acid reflux, but I credit that to my weight. My stomach feels swollen all the time. As many other Americans I can't afford health care and I am trying to manage this with exercise. Maybe there is an herbal treatment I can try? Please help! Thank you.......