I began to feel a sudden twitch/spasm feeling in my stomach, went to ER twice, no solution?

Hello, I’m a 16 yo male. On the evening of November 29th, 2016, I began to feel a sudden twitch/spasm feeling in my stomach before bed. ( after wrestling practice ) The next morning, I started having that feeling again. It would happen almost every 5 minutes. I would feel it in my lower left & right abdomen. When I got home, I called my parents and told them what I was feeling. When we went to the ER, they told me they saw a little constipation in my Ultra sound/X-ray. They prescribed me laxative. A week later, the twitching moved to my upper abdomen. So we went to the ER again because I thought it was serious. ( Keep in mind the twitching feeling hasn’t went away since I first started feeling it. ) They ran some tests on my blood, and told me they didn’t find anything bad. They also said it could be because of a change in my diet since I wrestle, or dehydration. A few weeks later, I’ve noticed some weight loss. I haven’t been working out or anything since 11/29 either. I also added fruit/vegetables in my diet (rarely ate fruits and veggies) also been drinking hot water first thing in the morning. Today is 12/26/16 & I still feel twitching/spasms in my abdomen. Hasn’t been happening almost every 5 minutes unlike what I was feeling 11/29. What do you think is causing this?

SYMPTOMS:
– Nausea
– Constipation
– Twitching/Spasm in abdomen
– Weight loss
– Mucus in stool
– Depressed
CHANGE IN DIET:
– Drinking warm water first thing in the morning
– Started eating fruits & vegetables everyday
– No more soda
STOOL:
– stool no longer appears long
– stool is broken into pieces, sometimes mushy.
– Sometimes green
*NO BLOOD IN STOOL*