Good idea to see your doctor and talk about how you are sleeping and eating. Most people struggle with both for a time after BD. Make looking after yourself a priority. Buy some food that you do fancy and have snacks. Dried fruit and nuts are good as high cal, or yoghurt/smoothies.
You would make it without friends & counselling, but call on both. I saw a counsellor from Sept to Jan, and it was helpful. Also, try and find activities that do take your mind off things. Notice what helps and do more of that. Manual activities can be pretty good. I renovated some furniture in the garage, and that helped.
It's good that you're doing a class. As time goes on, your concentration will improve. You may also want to think about keeping a journal. I poured a lot into mine in the early days. Though I haven't written there so much recently. I also have a gratitude pot, and put slips of paper in with things I am grateful for. It is easy to get so consumed by our sitches and forget that our lives continue to be blessed in many lovely ways.
It's tempting to just wait for replies to your sitch, but have a really good look at the forum and see who's who. When did they join? What happened with them? You'll see that there are lots of infidelity sitches in Newcomers too.
So, for now, just try and get yourself to a steadier place and keep your head above water.
I truly promise you that if you put your heart and soul into DBing - of course partly to try and save your marriage - you will truly save yourself, and you will be here in a few months time feeling much better, and that you have come a long way.
T x
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus