Oh my god i was literally going through the same thing last week, for about two weeks straight. I had a deadline for a business project and i would literally break night thinking about how i needed to do it, picturing different negative scenerios that could happen if i didnt complete it on time. Everything ended up going just fine. Truth is, it really all is in your mind. You have to trust yourself, and know that you can diminish your own anxiety because ultimitely you are the one that is creating it and it is not seperate from you. Once you finish everything you need to do for your deadlines, you will feel less stressed because you will have gotten everything out the way. I find it hard to do meditation sometimes when there is a lot on my mind, but its helpful to take five minutes and set an intention that youll only focus on your breath for five minutes and nothing else, and you can set an alarm so youre not sitting there waiting till the five minutes are over. Give your mind some clarity, and breathe , and know that everything passes and everything is temporary so all of the re occuring thoughts you have will soon fade away weather you believe it or not. I am an overthinker constantly having the same self limiting thoughts all the time, but you have to realize that you are the creator of your own universe and that nothing has to effect you if you dont let it, you choose your thoughts and emotions all the time and you have complete control over what you feel, dont lose touch with the power within you because you are the power ! i hope this helped and i hope you get a good nights sleep, try listening to binurial beats with headphones before you sleep and let it play throughout the whole night, its a type of music that releases theta and alpha waves to help you fall asleep faster, also chamomile tea helps me relax, as well as yoga 🙂 we all go through rough spots in our lives , youre not alone and you will get through it , best of luck . Also dont keep it together for anyone, live for yourself, be happy for yourself, and others around you will be positively effected by your happiness, when youre worried about keeping it together for everyone you just fall apart more because you feel more pressure to act okay for the people around you but this is your life, and you need to be happy for yourself, and happy with yourself so you can be happy for others.