I want a Divorce.....

I am 32yrs of age,  married for 4yrs,  no kids yet,  i and my hubby do have misunderstandings a lot to the extent that both parents intervene. Reasons for the quarrel varies from accusing each other of cheating, hubby demanding huge amount of money from me without stating why or using the money for any tangible reason, quarrel on late dinner at 8pm whenever i go visiting my parent.

We don't have social life,he rarely take me out  and if i ask he will say he is broke,we hardly communicate well d way couple should. Last year he picked up this habit of gambling(sporting bet) which i told him i dont like that he should pls stop cos i realised he invest heavily on it, have seen him play with 19k plus just in a day...
...and i also realised he do complain of been broke dis days. Above all is childlessness.  Medically he has a low sperm counts later turn to no sperm counts,  i was told i have a fallopian tube blockage at first and later go for another test years back and i was told no blockage. We have been on both orthodox drugs n herbal drugs...

...still no result.  We reach a conclusion to go for IVF and promise to set aside money every month for that purpose but my hubby has not been complaints,  no contribution from him yet,  we are to start dis January. On February  7th i saw 2 con doms in my hubby's bag while he told me is going to work dis got me crazy we...

Both had s3x d previous day. I Am so so confused and fed up with the marriage andi want  divorce but am scared. Where do i start from?
Please advice me.