Plz answer i am feeling myself the most helpless mom?

My girl is 3 months old. She drools alot, she is trying to bit my fingers, her own fingers, not taking pacifier and since 2 days she is excessively crying at night which broke me into tears. I am feeling very helpless. What should i do? my daughter cried in afternoon and at night alot. Soothing cannot even stop her from crying.. I know she is probably teething but can i do for her to make her relax. I cant see her crying so much :( Yesterday she cried for 2 hours straight at night