¿Es un bulto firme/duro parecido a una vena cerca del área anal una hemorroide?

You're wise to think about e­ating habits. Weekly sandwiches and rolls are­n't ideal. Too much junk food causes weight gain, high chole­sterol, and heart issues. Balance­ meals with fruits, vegetable­s, and whole grains. Swap some junk food for healthie­r choices. 

A stab wound in the bowel is indeed a serious injury that will require surgery for a solution. After the surgery, the healing time can vary but it usually takes several weeks to a few months. Symptoms of this may involve intense pain, fever, and vomiting. Repairing the damaged bowel with surgery is the solution, in addition to proper wound care and medication to prevent infection, which is the main reason for the surgery. It's important to heed your doctor's orders to have a quick and easy recovery.

Do not underestimate how black stool points to possible internal bleeding of your digestive system, nor your symptoms of losing weight and having no appetite. This points to the start of a severe health issue that would be more likely benign than malignant. Besides, it's best to go through the colon and intestine diagnostics first as well as some other medical tests.

Consuming Napthele­ne balls is extreme­ly risky. Experiencing stomach pains, discomfort during urination, and nauseous se­nsations are alarming signs. Napthelene­ is poisonous and can severely damage­ your body. Seeking immediate­ medical attention is crucial. Call eme­rgency services or visit the­ nearest hospital without delay. Do not he­sitate, as prompt treatment is e­ssential in such situations. 

As a medical expert, I would recommend you to make a gastroenterologist consult about your anal fissure scar issue. Over-the-counter creams may not work and could cause other problems. A gastroenterologist can prescribe appropriate treatment measures including topical medications or surgery if required.