I'm having pain in the arch of my foot, toes, ankle, heel, and up into the side of my leg. doctor said i have sciatica issues. could this be related?

Yes: The sciatic nerve travels from the back and divides into several branches down into the leg and foot and arch area. It can be related if the pain you're having feels like burning, tingling, shooting, electroshocks or any combination with those symptoms.

Sure Could: Sciatic pain can go all the way to your toes. Does your foot seem tender or painful? No rule says you can't have a sciatic problem and something like plantar fasciitis where there would be actual pain on examining your foot.

Yes : Sciatica can cause pain in the described areas. Sciatica or radicular pain may be differentiated from other conditions that cause pain in these areas as the pain travels along the course of a known nerve (dermatomal pattern). Based on spinal fusion history noted in your profile, this is likely lumbosacral radiculopathy (a form of sciatica).

Impingmt or tendinit: It could be sciatica (in w/c pain starts from hip and radiates downward), but since pain starts distal and radiates proximal, this sounds like nerve impingement or tendinitis. If pain is on the inside of the foot, could be tarsal tunnel syndrome or pt/at tendinitis ; if on the outside of foot, peroneal/sural n entrapment or peroneal tendinitis. Best to go see a foot specialist for custom orthotics.

Pain: It is entirely possible that there is more than one problem happening simultaneously . As such you may need to see a neurologist as well as your podiatrist for a team doc approach. The leg pain can be muscle pain from splinting off painful arch

Its All Related: Back is related to how the arch fell in your foot resulting in knee joints changing position that results in hip issues then translating to stress in your spine resulting in pieced nerves causing your sciatica. Thats said, likely improving your arch with support/orthotic will help reduce the back pain. Remember this will not happen overnight but will take time and your feet will hurt initially.