Im having severe pain in the back of my left heel when i put any pressure on it. its been going on for a few days. hurts worse when walking?

Heel spur?: Consider an anti-inflammatory and a visit to a podiatrist.

Get to a podiatrist.: You probably strained the achilles tendon insertion on the back of your heel. In some instances, a spurring on the heel bone can be fractured off. See a podiatrist and get some x-rays with proper follow up treatment.

Fracture or PF.: Could be many things, but the two most likely are either a stress frature or plantar fasciitis. The best way to know is to get an x-ray of your foot. Another clue is when it hurts: stress fractures are all the time, while pf hurts most with the first few steps in the morning, or after sitting for a long time. See a podiatrist to rule out tendinitis or nerve entrapment (less likely).

Heel pain: The best treatment depends on a lot things, age, activity, pmh because there can be a lot of causes. Start with stretching of your calf muscle 3x daily for 30 sec each leg. Ice, rest, use antiinflammatory meds and possible otc inserts. If pain continues, seek further assistance from your doctor. Hope this helps!