Question: 55 year old male. Was diagnosed and treated for throat cancer 2 years ago. Underwent radiation, and 2 rounds of chemotherapy. I am often tired and fatigued and need to take take a half hour rest/nap most afternoons. I’ve had tiredness for many years before my cancer treatment but not as severe as I do now. My tiredness is unusual in that I can feel generally ok one minute and suddenly I would feel a wave of fatigue through my body. My arms, legs… become very weak and I need to lay or sit down. I have a blood pressure and diabetes monitor and during these times my blood pressure averages 117-120 over 76-78; The blood sugar registers 4.6 to 6. My diabetes lab results also came out fine according to doctor. 4.7 3.3-5.5 mmol/L. My recent blood work results for testosterone and thyroid are as follows: Testosterone 13.9 8.4-28.8 nmol/L Testosterone Free Calculated 296 170-630 pmol/L Testosterone Bioavailable 6.9 4.7-15.0 pmol/L Sex Hormone Binding Globulin 46.5 19.0-76.0 nmol Thyroid TSH 1.8 0.27-4.2 My doctor says my testosterone level is low and because of my cancer, I will need to go on thyroid meds within year. I was also tested and treated for H pylori a month ago and have noticed no change in my symptoms. The waves of fatigue continue. I have to take things easy and rest for 2-3 days, then feel a little better for next few days (though I can feel ok one minute then tired the next). I have taken an extensive food allergy test of approx. 200 food items (and avoid items I’m allergic to). Just started B12 injections and improvement lasts for a few days. Is there anything else I should be tested for to determine root of my problem? Should I and do I have to continue with regular B12 injections. If so any long term side effects I should be aware of. Same for testosterone shots, and its long term side effects. Based on my thyroid results, should I be taking thyroid medication now? Am 6" - 185 lbs