Hi...
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns...
As per your complain difficulty in swallowing, fever and headache can be due to
throat infection and it can be bacterial [strep throat] or viral in nature..
As it started after wearing your retainers after one month without disinfecting them or cleaning them properly it can be a probable cause of infection.
Nothing to worry, you can take a course of antibiotics like
Azithromycin or
Levofloxacin, anti-inflammatory painkiller like
Ibuprofen, do warm saline gargles, gargle with a numbing mouthwash to relieve pain during swallowing and take plenty of warm fluids.
You can also take
Acetaminophen for reducing fever..
Remove your retainers and clean them well using a denture cleaner solution or an antiseptic solution and wear it ..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.