Hi..
PVD is a natural aging thing and very common
A retina check up is must to rule out any associated tears or bleeding etc..if those things ate fine..no need to worry ...slowly the spot will decrease or it will stop bothering you so much.
Some medication must have been given , i am presuming.
Keep
Diabetes, BP under control , try not to smoke or less at least.
Do regular eye checks..n see the doc immediately if there is increase in spots, flashes of lights or decrease vision,