Concentrate on you for the moment.initially use this place to help YOU to help YOU. Read as much as possible and relate it to your situation
I understand the pressure you are putting yourself under with the deadline looming. Without belittling your perception of that I would encourage you to try not focus on such deadlines.The date could come and go and nothing could change.SShe could decide to stay illegally. She could go on a world tour next week. You cannot predict nor control this and stressing over it will not change anything except make you feel worse.
Those are easy words to say but I realise can be hard advice to accept.Even if you do not like this advice I say it to help. In order o get the best advice here, you need to give us more specific details. Esp about your M history and recent problems.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together