hello and thanks for asking the query.
First of all you have not mentioned your age and would also like to know the details of ultasound report about the size of the tumour and other imaging features. you have also not mentioned if the size of the tumour has increased or it's the same over two years.
There are some tumour markers(Ca-125
,B-HCG,LDH, Alfa-fetoprotein) which can suggest whether your tumour is benign or malignant before planning for removal of the tumour. The list of investigations is long , My advise to see a good gynaecologist in your area who will advise you further tests depending on your age and USG features of your tumour,.
Pain ,burning and incontinence
could be because of UTI,
Get Urine test done and if nesessary get urine culture and sensitivity so that appropriate antibiotic can be started,
Unusual gain in weight could be because of hypothyroidism
Get your TSH tested.
is for cervical cancer
and not ovarian tumour.
Hope I have answered all your queries
wish you good helth and speedy recovery.