Note: rest properly and also EAT well. Sometimes I neglet both, but I have been feeling very tired for some months (a year maybe), I tought it was normal because of everyday life, but after blood tests turns out I had a lack of potassium o.O Turns out potassium controls muscles and hearth beat, and when it is low depression and extreme fatigue is a result (palpitations/dizziness when it reachs lower values - the reason I went to the doctor, twice this month). But I eat a lot of things with potassium so the lack must be a result of something else I don't yet know neither doctors (thyroid values are a little high, maybe it comes from that since it controls nutrients absorption amongst other things). Iodine is important for the thyroid, so I am reinforcing that in my alimentation while waiting for exams. Conclusion: sleep and rest well, but aslo eat well, in my case I have been negleting both for some time, sleeping only 6 hours per night and jumping meals with quick snaks because of laziness to cook, and now I am finding the consequences, the extreme fatigue and depression I have been feeling comes a lot from that, shame on me for being bad to my body.
Note: it is not your case, just sharing since this post made me think about that and the need to look after our own body needs properly, I'm working on that. Glade you're doing good, all the best to you.