Suggest Treatment For Discharge From Vagina

Hi, I am 21. I have two children and lately I have been having a weird discharge. Not white but not colored either. It soils my underpants and smells terrible! I thought it may be a yeast or BV infection, but not sure I can not get rid of it and it is making life misurable. I have been treated for both yeast and BV in the past and it still did not help! I dont know what to do.Please help.