Shir, you're just tired. I suspect you're suffering "burnout".
I agree with Zenkitty. Darling Shir, please for me, do what you have to do to stop this from getting worse, and give yourself the chance to regain your energy and enthusiasm. When I was a university student I pushed myself too hard. And when I started seeing signs of professional burnout before I had even entered the profession of my choice, I kept pushing. I got sick, and I kept pushing. I kept pushing myself until I completely destroyed my health. It prevented me from finishing my degree. I had to drop out of school and quit my job; I moved back into my mother's house, and while this gave me the time to rest up, and recover physically, it lead to disaster in another way. Because I was unable to finish my degree, I am stuck in an entry level position in my field. There is no way to go further, and I will never have the money to buy a house I like, or a car that is less than ten years old, or do any of the traveling I dream of doing. I have not been the same since - I do not have the nerve, the drive, or the energy that I used to have. If I could, I would make a bargain with G-d, to take on your stress and exhaustion so that you do not have to go through what I went through. I'm already ruined - if I could take it on for you, it won't destroy anything that isn't destroyed already. Please, precious one, protect yourself, because for as much as I wish I could do it for you, I cannot; and it will break my heart to think of you suffering as I did.
This [link] gives a summary of some useful strategies in preventing burnout:
People in my experience of 30+ years of avoiding burn-out proactively touch on all the factors noted above: they take care of themselves physically, emotionally, and sometimes spiritually; they work hard but also take dedicated down time away from their work; they enjoy their work rather than have it feel like drudgery; and last they have other interests.
"they take care of themselves physically, emotionally, and sometimes spiritually;" This includes getting a reasonable amount of sleep regularly (not that as a student you can completely avoid the occasional all-night study or writing session, but you will have to take steps to make that happen only rarely); getting some exercise that you enjoy and does not stress your body; taking time to truly relax regularly (whether that is taking a bubble bath, or getting a massage, or meditating, or something else) other than sleep; putting the effort into eating foods that are truly nourishing rather than whatever is quick and easy to get. Taking care of yourself emotionally, well that is such an individual thing that it is likely that you know what you have to do. If you need more suggestions, well we can help you here, but that will be a lengthy discussion that can be started later. Spiritually, that too is so individual, whether directly tied to religion or not; this is another thing that we could discuss with you at a separate time, if it is what you need.
"[They] work hard but also take dedicated down time away from their work". This goes back to taking time to relax that is other than sleep. And in order to do this, you will have to set firm limits on what you can take on. You may have to cultivate the skill of saying no to new projects. You may also have to find ways to cut back on what you have already taken on. I know this is the complete opposite of your nature and personality, but please remember that your long term health and your future success depend on this.
Here is another link that may be useful [link] even though it is specifically for the caregiving professions, I think all the points can apply to almost any situation.