Hello. i am a 18 year old girl. I am constipated. I get really bad pains in my abdomen a lot if there is extra gas. I burp a lot if there seems to be extra gas. I weigh 105 lbs, but i lost 10 lbs in the last month. I feel the need to urinate but cant do anything. This has been happening for the last year. I have some loose motions. I also get pain in my abdomen after eating. This pain is continuous. Also, I have no blood in my stools. Also, when i do urinate, there is a ton of it with no apparent cause (I have not been drinking fluids any more, probably less), This has been happening since march of 2012. I have lost 10 lbs since march of this year. should i get a bladder stress test done because sometimes when i cough or laugh, my urine leaks. Or, should I get a Urodynamics or a Urinalysis done. what is done during these because i am scared and embarrassed to go. help.