Urinary Retention/ Discomfort. I do?

I am a 24 years old women.I have previously diagnosed with Over Active Bladder. And I got relieved after 4 years with this finally with the help of Mirgao 50. Its been almost 8/9 months I have been cured properly. From last 2 days,I am feeling urinary discomfort during urination. I am feeling urinary retention in my bladder At morning 6,I went to urinate,the amount was quite much.then again I felt like ,the urine release wasn't clear . I went again.Again,I felt the urine is retaining in my bladder . I am also having a little stomach pain and I can feel that my stomach is getting heavy. My stool is clear. Recent Changes I have made to my diet : I am underweight,hence taken some advise from a nutritionist and having buffalo milk,peanuts,cashews all these while.my daily routine This change is from past 1 month. Even right now while typing this,I am feeling my bladder is not clear and feeling uncomfortable Having stomach pain. Please suggest me something.what should I do? I