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You have said that you feel your ears are blocked, but you didn't complain of any pain. So blocked ears without pain is seen most likely in a condition called serious otitis media it is a condition in which non infected fluid accumulates in the middle ear. Serous otitis media often resolves spontaneously. That is why your doctors have asked you to wait for it to resolve on its own. Due to the fluid accumulation in the middle ear it causes temporary conductive deafness or aural fullness. It is only temporary. You need not worry about it. Once the fluid is cleared off from your middle ear the deafness will definitely resolve and you will get back normal hearing capacity. This will happen soon. The doctors have wisely diagnosed and started very appropriate treatment with antibiotics and decongestant. Continue using the decongestant tablet for a week. Give at least a week time for spontaneous resolution. If doesn't happen, then consult with an ENT specialist. He will examine your ear, mainly the tympanic membrane. He might also ask you for an Audiogram test to evaluate the level of conductive deafness. Sometimes, the doctor might advise you for a simple surgical procure called myringotomy in which small incision is made in the tympanic membrane which will release all the fluid collected in the middle ear. Following this procedure you can expect to hear normally and you will be relieved of clogged sensation.
Hope this helps. Please feel free to ask if you need further help.