Accidentally dropped the blow dryer and it landed on my foot between my big toe and"ring toe." having throbbing pain there. What to do?

Get an X-ray. Ouch! you probably injured yourself and the only way to determine if you did something is to have your foot examined and an xray taken. See a podiatrist.
Pain . Is not normal. Need an x-ray to make sure no fracture is present si suggest podiatrist in area. Rest, ice, elevation and compression should be used until its checked. Could be simple contusion but best to have it checked.