Cystitis Problem. Bacterial infection?

Good Evening doc, I am having pain in lower left abdomen mainly when i pressed it by hands. No problem in urine, no itching irritation. Having constipation and mettalic sour water tatse in mouth. Today went for sonography and its shows inflammation of urinary bladder (cystitis) Cbc, kft,lft are  normal. Sonograohy and urine report attached. Now taking nitrofurantion 100mg bd for 7 days. Now my question is whether mettalic tatse and constipation is related to cystitis or not? Will this medicine will cure cystitis ? Or i need to go for more testing ? Can cystitis happen without any problem in urine flow or irratation ? Or it something else or any other bacterial Infection? Im very worried and tensed .. Please help doc