I recently had tonsillitis for about 7 days, with 3 days of fever. I got antibiotics from my doctor fairly early and experienced an improvement after a few days. I've had me/cfs for about two years and it has been a very slow progress with many improvements and crashes. I've managed the disease quite well with pacing and rest and have always recovered after my crashes. But now I feel that my health has been deteriorated after the tonsillitis and I feel much weaker in my body, especially the legs. My energy levels are lower than before and I feel tired almost all the time. I hope this is only temporary and that I'll recover from this in due time. Me/cfs greatly increases the recovery time and even a healthy person can experience a lingering weakness after a harsh cold or influenza. Have anyone else experienced a deterioration after a sickness and recovered to the same state as before the sickness?