What to do if i have a pain in the bottom of my foot near the heel?

Plantar fascitis: Probably plantar fascitis or flexor tendonitis. This is a problem with lack of support. Stretch the arch and achilles and add a support to your shoe.

Combo treatment. : If you have plantar fasciitis, and hurt most with the first few steps in the morning, the more you can do together, the better: #1: supportive shoes. #2: firm inserts or orthotics. #3: oral antiinflammatories (check with your doctor). #4: stretching your foot and calf. #5: icing (10 min at a time). You may also need physical therapy or cortisone injections, or eswt if available in your area.