Urine stream changes. Side and vitamin.

Since 3 months I started noticing changes in my urine stream, I feel my urine output has reduced does not matching with intake, for example if I drink 3 glasses of water I hardly urinate 1 glass after 2 hours of drinking the water and there will be slight swelling at ankle join earlier I suppose to urinate 10 times a day and frequently urinate almost every 1 hour,I m an occasional drinker same happens when I take alcohol even after drinking full beer I hardly urinate and my ankle joint swells a little apart from this no discomfort nor a pain in any place my appetite and stool.is normal, I consulted doctor and almost done each and everytest,  creatinine, LFT, ECG, Echo is normal and lipid profile is at higher side and vitamin.D and Iron deficiency doctor has put me on medication and BP is slightly high, apart from this no issues, doctor might be suspecting BP would be the cause for this situation, kindly help with your inputs and any suggestions on this condition