yes, it should say you can take internally and use as an external soak as well on the Epsom Salt
package, and good job finding this site so quickly after becoming ill, within the year, very impressive. It took me 3 years and many many doctor and acupuncture visits to find this.
My chronic fatigue/IBS came on suddenly too, one day just blamo... so do not come to a quick conclusion that it's a virus, it is possible but that is what typical western medicine says about chronic fatigue syndrome, which IBS usually goes along with.
It does not surprise me to hear that you have IBS with your illness, as most diseases start in the digestive system, but if you really feel like it is a virus there are many spices and herbs that are good to include in your diet to help cleanse out the virus.
Most likely though, it is simply illness due to poor digestion, and poor absorption of nutrients from food. To fix this, you need to improve your daily life, as well as start doing bowel, liver and kidney cleanses. Most importantly, and strongest effect being liver flushing, and the bowel, kidney cleanses with improved diet and lifestyle to support the liver flushing. Follow this and you will be well very quickly since you have made it to this site so fast.