Persistent sloshing sounds, clicking and muffled hearing are RARELY due to water in the external ear canal. In the majority of cases, such water can quickly be cleared, simply by putting the affected ear down and manipulating the pinna (the external part of the ear). When the symptoms are persistent over days, it's almost always due to fluid in the MIDDLE ear, caused by barotrauma. And I'd be extremely suspicious that that is what has happened here, both because you are a novice and because you made the statement that you were blowing very hard. Equalizing, when done properly, should require very little pressure or effort.
You might benefit from watching THIS video, and reading THIS piece on equalization techniques.
Treatment of barotrauma is mostly time. Some ENT physicians recommend the use of decongestants like Sudafed or Afrin for a few days (assuming you have no contraindications to such medicines), and there is some anecdotal evidence that the use of antiinflammatories like ibuprofen may be helpful, but mostly it's just tincture of time.
You might benefit from watching THIS video, and reading THIS piece on equalization techniques.
Treatment of barotrauma is mostly time. Some ENT physicians recommend the use of decongestants like Sudafed or Afrin for a few days (assuming you have no contraindications to such medicines), and there is some anecdotal evidence that the use of antiinflammatories like ibuprofen may be helpful, but mostly it's just tincture of time.