Thank you for your query at DoctorSpring.com
I understand your concern.
It is clearly evident that you have been working extremely hard and it is taking a toll on your body.
Such work schedule gives rise to a lot of stress which can lead to the following symptoms : inability to think clearly, irritation, headache, hypertension in later stages, digestion problems, and insomnia.
The symptoms you described can be due to the constant stress you're subjected too.
What about your appetite? And food habits?
Do you drink/smoke?
Do you sweat excessively?
Though it seems to be nothing serious, and secondary to exhaustion, i will advise you get your CBC ( complete blood count done, and your liver function test ( LFT ) checked, to localise the cause of your symptoms. If possible also get your BP checked, and let me know about its value.
Since you have been so exhausted, it will make sense if you can take a good break for a few days. I feel in your case, it will really lead you to recover and also improve your health. Stress is an extremely important risk factor, leading to hypertension, obesity, e.t.c later on. So it has to be controlled.
Hope this was helpful,