Yes. Your doctor. Make an appointment today.

You're in Italy?
I imagine a stool sample analysis might catch a parasite infection.
One web page said that pale lips can be a sign of not enough oxygen.
Have you had a chest x-ray?
Have your tonsils been looked at again (by an ear, nose throat doctor?)

I wouldn't know where to go with your vague symptoms, and what it says below.
There's so many types/causes of allergies, cancers, and autoimmune diseases. Is
there a family history of any of those? Before you embark on possible multiple
investigations, it would help to know more.
J

http://my.webmd.com/hw/health_guide_atoz/hw41342.asp
IgE. A high level of IgE can indicate a parasite infection. Also, high levels of
IgE are found in people who have allergic reactions, asthma, atopic dermatitis,
some types of cancer, and certain autoimmune diseases. Rarely, a high level of
IgE may indicate IgE multiple myeloma.

Here's MM http://www.cancer.gov/cancerinfo/wyntk/myeloma

Since you are 19 years old, I assume you are going to school or at
least were going to school.  You my alos have chnaged to a different
apartment if you staretd college.

Let me just share my experience: ABoutt he time I started going to a
University, I also moved to an apartment not to far from school.
Though more expensive than most apartments around the University, due
to the humidity in that city, the requirement on A/C maintenance is
quite a job.  Naturally, apartment complexes and places like school,
fails miserably.

In summary, I endured lingering low grade fever for a long time, not
realizing that the mold in the school building - I had taken crae of
air duct cleanign of A/C in may apartment within a 6 monhs; it took 6
motnhs only because of the procrsatination of the management. and I
had to threaten that I would report to Housing Authority - were
causing it.

My fever didn't get to 101 like yours but between 99.5- 100.6 'F

You may simply be allergic to mold (Allergic Rhinitis) or you may have
Non-Allergic Rhinitis like I was diagnosed with.  My diagnosis came
after many different blood test and other test such as stress test,
EEG test, ebcause I was just weak ...because my body was fighting this
fever due to mold.

Got to a *good* Allergist first and may even need to go to ENT (Ear
Nose and Throat Specialist) if the Allergist recommends you to do so.
In my case, the Allergist did Skin Allergy test, and CT Scan. I wish
he did food Allergy test too.  He probably didn't based on my answers
to the questionnaires ont he form.   would have prefered he did to
thoroughly rule out sicne I was spenign so much money doing all those
other tests anyway.

Before my diagnosis, I was beginning to think that I had soem weird
disease though I didn't have fever during school breaks, i.e failing
to realize that my environemnt was causing it.

Hope you find the culprit.

Good Luck.

Good luck.

BTW, my fever was measured in ear.