I'm so sorry to hear about Mashka's troubles! My cat of 15 years recently got a blood clot and because of its severity we had to put him down. It was a very hard decision and I can understand completely how traumatic this all is for you. It is extremely admirable that you gave up all of your savings - that you struggled for at a low wage - to save Mashka's life. I am sure Mashka is very grateful and appreciative of your love!
With our cats, we could often get them to take medicine by hiding the pill in a soft treat. There are treats out there that are shaped like "pillows" that are soft. You can sort of squish the pill INTO the middle of the pillow which the cat will then eat. So if Mashka is resistant to eating the pill again, you can give that a try. We tried the tunafish trick but our cats eat around the pill and only eat the tunafish
It is true that a cat that starts getting blood clots often keeps getting them. This is what happened with Hamlet, his "final clot" was the last of a series of them. Once Mashka is feeling a little better, I would talk with the vet about ideas. They often have medication that can help the cat be less likely to have clots. It might be worth looking into that, so you have many more happy years with your beloved pet!
Let us know how things go!