Regarding your muscle fluttering, which I will assume are twitches, these may be due to benign fasciculation syndrome, which I will abbreviate as BFS, a condition in which there are involuntary twitches of various muscle groups, most commonly the legs but also the face, arms, eyes, and
tongue. These may be related to anxiety/stress, caffeine, and often occur after recent strenuous activity or muscle over-use.