Thank you for writing.
Thick saliva can be caused due to the body's inability to make enough of it. This can be caused by certain medications, dehydration or something called Sjogren's Syndrome. Sjogren's syndrome is an inflammatory disease. The immune system destroys cells in exocrine glands. It occurs most often the tear and salivary glands. It is a lifelong condition. There are two types:
Primary Sjogren's syndrome—occurs alone
Secondary Sjogren's syndrome—occurs with other rheumatic conditions such as rheumatoid arthritis , scleroderma , or systemic lupus erythematosus (lupus)
Tonsil stones (or tonsilloliths) are white or off-white balls that appear on the tonsils. While part of the upper respiratory tract, doctors believe that the tonsils also play a role in the immune system, by preventing bacteria and other particles from entering the body (although those who have had their tonsils removed show no increase in susceptibility to infections or illnesses than those who have their tonsils).
Anon, I suggest you talk to your doctor about your symptoms.