I dont think there is any Doctors on HB only knowledgeable people who have experienced the same things as yourself and can advise you.
The rash you had after taking Antibiotics is classic
of MONO. People who are infected with MONO cannot take Antibiotics because in 60% of cases a rash will develop. This happened to me also.
MONO usually does start with a sore throat. In the majority of cases MONO begins with Tonsilitis which in-turn causes the lymph nodes in the neck to become enlarged. You do have symptoms of MONO. Arrange for your Doctor to perform a MONO Spot test or see another Doctor and ask for the same blood test.
Once someone comes into contact with a infected person, providing you haven't had MONO yourself then there is a strong chance you will become infected with MONO and you will become infected with MONO within 5-7 weeks of coming into contact with the above person. Because you only came into contact with the infected person 2-3 weeks ago then MONO may be in its early stages and you may notice your symptoms will become more noticeable to you and/or others. Its also very possible that MONO has already run its course and will soon be out of your system. MONO usually infects people for 7 weeks - in a mild case, even less.
MONO causes a enlarged spleen and in severe cases a enlarged Liver. Consumming alcohol regularly when your Liver is enlarged with MONO can cause other health problems. One time drinking alcohol will not result in Liver damage. If you continue to drink regularly to a moderate/heavy level while infected with MONO then this could be harmful to the Liver but this only occurs in very rare cases. MONO is rarely dangerous or life threatening as its simply 2 viruses that develop into MONO and causes a lot of nasty symptoms. Hope this helped.