Need some or relics from anal fissure been suffering for about 3 months had colonoscopy and was diagnosed with one fissure and hemroids

Didn't your doctor offer to write up prescriptions for this, or suggest OTC creams, etc? Or you ask him for this specifically?

Have you tried any OTC meds?

Yes and some prescrip suppositorys

Can oral gel be used

Read the label. Is it recommended for your problem(s)?

Oral gel is recommended for the oral mucosa, not the rectal mucosa. If you are having continued problems, you need to revisit your proctologist.