Hello and welcome to Just AnswerCustomer
As long as fever, vomiting, or diarrhea, aren't present you can wait. At this time, with your listed symptoms, it appears that what you are experiencing are cold symptoms. This can cause a minor build up of fluid within your ears, hence a 'blocked ear' feeling. If at any time an earache develops an ear infection may be present and you will need to see your physician for an antibiotic.
Saline nasal drops can help with the congestion, as well as some over the counter medications such as sudafed or benadryl. Otherwise, take small frequent drinks to help with the dry mouth. A cold usually lasts 2 weeks.