Overweight. History Of GERD. Have Anxiety, Diarrhea And Abdominal Pain. What Am I Suffering From?

Question : 40 year old, 6'3" 325 lb male. No prior surgeries and no chronic health issues beyond those addressed below. No known food allergies or intolerance, but no recent testing. General sedentary lifestyle with poor dietary habits: high fat, low fiber, over-eating. For the past 25 years, stress and anxiety commonly leading to acute cramping, urgency and diarrhea/very loose stool. Past 5 years--history of GERD, occasional to frequent loose, semi-formed tan-colored stools (sometimes pellet-shaped, mostly soft normal shape) fatty residue (floats), maybe also mucous (?) and very, very rarely with a small speck of red. Bloating and gas common. No rectal pain. Dietary habits have deteriorated over past 2-3 years coinciding with increased incidences of cramping (which seems more painful than in the past and more to left lower abdomen) and urgency, etc.. Also in that period, 2 to 3 episodes (lasting 3 to 6 days each) of mild to moderate lower to lower-mid, left-sided or bilateral abdominal pain with pressure, bloating, loose XXXXXXX and fatty stool, mild fever (99.1-99.4). This following bouts of over-consumption of rich/fatty foods over course of several days. Most recent episode is ongoing, now in 6th day. Again, over-consumption led to gradual pressure/bloating over 48 hours, then pain thereafter about 3.5-4 inches below the naval, bilaterally 2-3 inches on either side. Days 1-3: 99.1-99.4 fever with heightened skin sensitivity all over body (mild pain, tingling) and mild chills. Watery stool with bits of floating (about 50 pct of fecal matter), tan-colored whispy fragments. Small volume about 5-6x per day, passing of only minimal gas. Abdominal pain almost constant though seemingly worsened by act of lying down, when sitting whilst hunching over (compressing lower abdomen/pelvis) and when pants/belt pressed tightly against abdomen. No food, only water days 1 and 2. Liquid (chicken soup) diet day 3. Days 4 through 5: Whole wheat bread, fish, cooked veggies, rice, bananas, XXXXXXX chicken, oatmeal...all tolerated well. BMs more solid/formed but still a bit soft and light in color. Abdominal pain subsiding over past 2 days to a general "soreness" (like things are healing?) of a "2" on a 10 scale with 10 being highest pain--and pain only occasional or positional (sitting/hunching). No fever, and gas passage greatly increased both out of rectum and throat. Day 6 and into Day 7: I got over-confident (in retrospect) and ate a meatball sandwich for lunch and 4 slices of pepperoni pizza 8 hours later. Within 1 hour of dinner, developed the same abdominal pain as described above (ranging from 3/10 to a 6/10), moderate abdominal pressure and no gas passage. No BM so far. No fever. Also, the pain is crampy in feel, fairly dull and sometimes it feels like the pain radiates down to my pelvis and occasionally the penis. When I drive, if the car goes over a big bump or I'm thrown a bit side-to-side, the pain increases. Thank you so much for your assistance!