What Causes Severe Constipation, Tightness In Left Shoulder And Intermittent Chest Pain?

I’ve been struggling physically for quite some time and I am beginning to lose hope that I may never find out what is wrong with me. I have been extremely constipated for several months, and for a period of about four weeks I was unable to pass any stool. I am now taking the Probiotic VSL#3 capsules once daily and Lactulose 20gm/30 ml between three to four times daily. This has allowed me to have bowl movements about every other day. However, when I do pass stool it is typically foul smelling and alternates between three different states: small and skinny strips, floats and sticks to the side of the bowl or long and ‘S’ shaped, as if it went through a twisted path. I have also been having other issues, such as with my sleep. I find it difficult to make it through a full night without waking up every hour or every other hour. I have also been waking up soaking wet in my own sweat. I take Seroquel XR 150mg for depression, which should also help me sleep. There has been tightness in my left shoulder and a feeling as if someone has their hand loosely wrapped around my left arm at the junction between the upper arm and lower arm at the elbow region. I have also been having chest pain that comes and goes. It is a sharp localized feeling on my left side that radiates outward and sometimes it feels like someone is squeezing my heart. My lower legs and feet have has a numb and tingly feeling as well for quite some time. Additionally I have occasional muscle spasms brought on for no particular reason. I have also been having strange headaches that feel as though someone is pushing their finger into my head. I have been to the emergency center two times in the past month because of these issues, once for my bowels and the other for my heart. Approximately two weeks ago I met with my psychiatrist and he prescribed Buspirone 10mg three times daily for anxiety. I have had many tests and blood work done and everything has returned as normal. I have had an EKG done, abdominal X-ray, abdominal MRI, blood work checking for blood glucose levels, thyroid and other functions and everything has checked out as fine. I am tired and fatigued all the time and to be honest I feel as though I am dying. Someone please help.