Before I became too ill and broken to work, I did massage. It is not uncommon to feel "sick and sore" from Swedish massage and especially Lymphatic massage.
If you have someone who is good and doing it correctly ( someone trained and certified in it, not someone who did a "day training") they know to work carefully and slowly since you are priming pumping the lymphatic system. I would love to do lymphatic massage but I had real difficulty finding someone properly trained in my area.
I would think we would be even more likely to have flu symptoms due to not being as active or upright as most healthy people.
Massage therapists are trained to tell their clients to drink plenty of water after a massage for this very reason. If you plan to continue, I would let the therapist know and If you didn't drink water, drink plenty of H20 (I would consider adding some electrolytes to it) and hopefully the release of toxins won't affect you so dramatically.
keep us posted! take care
