Low RBC High ESR, urine leak, neck lump.

For last six months I have done CBC thrice. Hg - 13.5, RBC- 3.9 (Normocytic Normochromic), WBC - 6.5 (adequate), Platelet - 156000, ESR - 50. I have noticed that everytime RBC is between 3.8-4.0 but normal range is above 4.5. Platelet has reduced from 166000 to 156000. ESR is always between 40-50. WBC is always normal. I lost around 5-6 kgs in last 3-4 months, I was having oats for 1 month. I am having urine leakage problem during sleep and nocturia also leakage when changing position throughout the day. USG,RE and Culture, normal. Uroflow shows 9.6/6 reduced flow, doctor gave Mirago. Can this be due to overactive bladder? Last week I also had a sore throat, my parents also had it, it got resolved with Azithromycin 5 days,  since then I noticed a lump in my right neck which has no pain and not reducing in size. I am concerned if I need ny further investigation or which doctor should I visit? Is my CBC a matter of concern, as my RBC is low and ESR high and platelet borderline fr 6months