Community medical question

I am a 23-year-old female and for the past few months I have been experiencing persistent fatigue, stiffness in my bones with cracking sounds during movement, mood swings, excessive hair fall, rough skin, and cracked lips despite drinking plenty of water. I also feel unusually thirsty most of the time. These symptoms make me think I may have some nutritional deficiencies, which is why I am considering starting a supplement. I am confused about whether a multivitamin or a calcium-based supplement would be the best option for me, and I want guidance on which one would suit my condition the most.