Hello, 34 / male here. Over the past two weeks I've been experiencing, the best I can describe it, a rapid heart beat immediately after eating, then feeling very tired and weak 1 1/2 or 2 hours after eating. The fatigue usually lasts anywhere form 4-5 hours. One time it lasted 6 hours. I've had heart rates between 90-110 (aver about 65 in the morning, 85 for hours after eating and then dipping back to the 60's by night), but the most challenging symptom is a persistent pulse that I feel in my neck and chest, practically all day but diminishing, but not completely gone, by early night. Libido is shot. Any amount of exercise, seems to have a negative effect as well. It feels a lot like overtraining but I haven't been training for anything for at least 6 months! Last week, I tried to do a light, fullbody workout, using lighter weights, about 20 minutes later, my heart raced out of control and totally thought I was having a heart attack. It was most likely anxiety that my heart was beating so hard, but probably not as fast as I thought. Since then, I've attempted to do half the workout of what I originally attempted and 20 minutes later, my heart pounded half as much. Otherwise, I've only tried to walk for about 30 minutes but it totally wipes me out for the day. Also, getting up from bed or standing up tends to set my heart off a little. Walking up the same flight of stairs to get to my office leaves me a bit worked also.

My symptoms are the worst in the morning, after breakfast. Towards the end of the day, especially recently, my excessive pulse symptoms seem to go away. Over the past 3-4 days, my symptoms have improved as my meals consist mostly of 1 cup of oatmeal mixed with one diced apple. I haven't had as much energy but my symptoms are much better. Anything tasty aggregates my symptoms (hard to digest foods). Even as I write this, the sensation of my beating heart in my neck is much better than it was 4 days ago but still noticeable, definitely not normal. My general practitioner has suggested I drink more water. Drinking more water alone improved my symptoms greatly but I still can't eat larger meals or exercise. I tend to pee a whole lot more now but still feel thirsty. Literally, I can drink a glass a water and I'll piss it out in an hour and still feel a little thirsty. In the morning I'm super thirsty. Given my blood tests, it doesn't seem that I'm diabetic.

My recent blood work just came in and nothing suspicious. Cholesterol, glucose, blood counts, thyroid, etc, doctors says it's normal. If anything, my blood pressure is on the high end of normal, according to my doctor.

Otherwise, the only other oddity that I can point to is the flu, which I just got over about 3 weeks ago. Perhaps something residual? A friend told me to look into adrenal fatigue. I haven't really looked into it but I thought I might post something here to see if anyone else may offer any insight. Thanks!