Menstrual problems. For your reply.

I am having a menstrual problems ..sometimes it comes every month but sometimes its takes a gap of 2 or 3 months apart from that sometimes it also last for more than 7 days ... i also have another problem related to my vaginal part its always wet which makes me feel bad as just because of that it also makes my clothes wet from my vaginal part... please let me know what should i do for my menstrual problem i did consult the doc when i had my periods lasted for more than 7 days so doc gave me a medicine which stopped my periods n everything was normal again but it started again.. so please let me know what to do??? will be awaiting for your reply .... i also wanted to a sonography please suggest me about sonography also