Thanks for the query.
Yes you are correct you might have got a glandular fever
Actually amox should not be given in this condition.
It can cause reaction.
The red rashes can be urticaria
Treatment with anti histamines
may be required.
Please meet a dermatologist
and discuss regarding this.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.