Hi.
Thanks for your query.
Noted the history about a 18 year old female, feeling heavy kind of pulling pressure in lower stomach for the past one week around bladder area, fell bladder emptying in bathroom, gets shooting pain at the end, urge to push more urine at the end, ...
The history you have provided so well is indicative of
cystitis with or without a stone in the bladder.
I would advise you the following in such a situation:
Send the sample of urine for routine, microscopy, culture and sensitivity.
Tests of blood for infection.
Ultrasound of the whole abdomen particularly for genitourinary system.
Get a course of an antibiotic, urilizer.
Take plenty of oral fluids.
Further investigations and treatment as per the opinion of an
Urologist.