What Causes Tingling Sensation In The Hand And Muscle Fatigue?

Hi. Back in September, I started having a bit of tingling in my right hand and right foot along with muscle fatigue. The hand got better, but I still, at times, have a strange sensation in my foot. Not tingling, per se. I met with a neurologist who said it would get better over time. I had an MRI done that was clean. I recently got back from Mexico where I wound up getting travelers diarreah toward the end of our trip. Immediately upon arriving home, I got a cold sore (I get them at least once a year) and felt pretty horrible for about a week. Very run down. The muscle fatigue and off feeling has come back and been back for about 3-4 weeks. Muscle fasiculations in my calves, right eye twitching....just feeling unwell. Does this warrant another trip to the neuro, GP, wait and see? I m also visiting a gastro due to some intestinal discomfort. I believe it s Gastritis along with reflux as I ve been having symptoms. I m wondering if stomach issues can cause vitamin deficiencies and maybe this is where the muscle fatigue and fasiculations are coming into play.