Pain in big toe when i "crack it" and now severe pain in this big toe.

Don't get Crack'in.: It may be that in you need to "crack" your toe, you have really cracked you toe, or at least damaged the surrounding soft tissue. Stop harming your toe and see if the problem resolves. If not y, you need to consult a specialist.

Have it x-rayed: a capsulitits, arthritis, infection, gout, fracture are all possibilities...

Be seen: THere are a number of posdibilities, I would not hesitate to be seen for an accurate diagnosis.