What is Metatarsalgia?

Hi I have a question: is it normal for the pain to be worse first thing in the morning or when you first stand up after prolonged sitting? I suspect I have developed metatarsalgia as I have recently started road running and the pain is in the indicated region. It is significantly worse when putting pressure on my foot after resting or sitting.

I had a lapiplasty bunionectomy and now my hallux joint can no longer plantar flex and has limited dorsiflexion. The joint is leaved and inflamed still after 10 months and causes forefoot supination.

I strongly believe it’s because of metatarsalgia but I don’t know what to do about it.