I tend to have chronic sinusitis, I have thick yellow mucus/post nasal drip yet no other symptoms how can I take care of this without antibiotics! ?

See doctor. Saline irrigation daily may help , otherwise you will need to consult your doctor. Whether you may need antibiotic or not depends on how long you have had these symptoms and whether the infection is indeed a bacterial one (vs fungal or viral).

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I have chronic sinusitis and post nasal drip, also pharyngitis. I've noticed some yellow blisters lumps in the back of throat? Help

Possible cobblestone. The term cobblestoning is used to describe streaks of lymphoid tissue (the cells that fight bacteria) on the posterior pharynx (throat) which is usually seen with allergic rhinitis (chronic runny nose). If present this is a normal response to chronic inflammation. Read more...