Vuj 5mm stone hyperdense. 3 months?

I have kidney stone identify on last October kidney stone 5mm puj in ct scan. I took some tablet urimax0.4 mg for 7 days. Then I stopped I leave the stone matter. Now March 3 I have moderate pain on my back. Then stop my urine flow.so I'm panic. Immediately I go to hospital took ct scan RESULTS A 5mm sized hyperdense  calculus in left vesicoureteric junction with mild pelviureteric prominence. Urinary bladder is empty with generalised wall thickness (8mm thickness) - cystitis. Let's come to my questions 1,What is cystitis?8mm thickness is abnormal? 2,first ct scan results mentioned non obstruction 5mm calculus. But now second ct scan mentioned nothing about obstructed or non obstruction. How to know block or unblock? 3,how long I wait to pass 5mm kidney stone? 4,5mm stone in puj on 23 October now in vuj It takes around 3 months for traveling puj to vuj. Now am wait for another 3 months? Pls answer 2,I have severe abdominal pain on last September I took ct scan on October.