What should I do about my unusual bowel movements?

According to your symptoms of bloating, gas, diarrhea and stomach pain after consuming the leftovers you most likely have cases of food poison or intolerance. Generally, it is better to seek advice from a specialist and undergo testing in order to determine the root of your symptoms. In the meantime, follow simple diet

Indigestion can indeed be a common adverse effect of some antidepressants. Gaviscon syrup is generally safe and may relieve the pain caused by acid reflux. However, it is always better to check with your healthcare provider before you take any kind of medication. They can give you individualized advice based on your particular antidepressant and general health. However, try some habits like eating less and staying away from triggers like spicy foods. 

Bulging veins around your rear end are basically varicosities, and such blood vessels are called hemorrhoids. This can occur if you strain when having a bowel movement, are overweight, or sit for extended periods. The signs can be pain, itching, or bleeding. To feel better, use over-the-counter creams or sit in warm water (sitz bath) several times a day. More fiber intake can be really beneficial as well.