Just seeing 1 floater but it is a whopper. Anythig I can do?

Surgery possible. If the floater is long-standing and in center of vision, surgery is possible to remove it. There is no other 'cure'.
Floaters. Most common it is recommended to have an immediate exam when they first occur to rule out retinal tears or detachment. If there is only floaters, then wait a year and if they are still symptomatic then consider a vitrectomy to remove the vitreous and floaters.