Had mid foot fusion exactly 7 weeks ago. Yesterday I accidentally stood on foot. Did not feel any pain and still not in pain but toes turn blue and slight tingling at sole of foot. Worried that I will have done some damage and have a non union.

Did you call your doctor and tell them? This would require an actual examination (and likely X-rays) to determine if harm has or hasn't been done.

Report your concerns to your doctor and let him follow up.

Of course you did some damage, for heavens sake ! Did you not receive after surgery care from the nurse or doctor ?

You report this to your doctor NOW !

It probably felt good because your foot was still under anesthetic.