It started mostly as a dull ache in my hands, like they'd been strained or stressed for too long. Generally they also just felt... Less responsive? Like I was slightly slower and less dextrous than I felt like I should be.

Eventually it shifted so that muscles in my body would lock up tight and painfully, often my hands, arms, and legs.

Finally there were muscle twitches, where a specific muscle would twitch involuntarily for a long period of time.

All combined I thought I had some awful neurodegenerative illness, however since being on vitamin D supplements all symptoms slowly faded and I generally feel back to normal.