Yes
Yes, chickenpox is contagious two to four days before the rash appears.
Yes, in chickenpox, fever typically begins before the rash appears. Generally, the fever can start one to two days prior to the onset of the characteristic vesicular rash. This early fever is often accompanied by other symptoms such as fatigue and headache. The rash then develops in stages, usually following the fever.
Have you had chickenpox? If so, could be shingles.
Smallpox, Chickenpox, Monkeypox, Cowpox
Shingles is not considered infectious once the rash has crusted over and all the blisters have dried up. This typically occurs about 7 to 10 days after the rash first appears. Until that point, the virus can be transmitted to individuals who have never had chickenpox or the chickenpox vaccine, as they can contract chickenpox from shingles. It’s important to keep the rash covered to minimize the risk of spreading the virus until it is no longer active.
You cannot get shingles from someone who has it, even if you share the same bathroom. Shingles is caused by the reactivation of the varicella-zoster virus, which also causes chickenpox, and is not transmitted from person to person. However, a person who has never had chickenpox or the chickenpox vaccine can contract chickenpox from the shingles rash. It's important to avoid direct contact with the rash to prevent this.
Normally, people recover fully from chickenpox and it does not affect life expectancy.
If you had it as a baby, it could be chickenpox: if not enough immunity is built up the first time, then the varciella-zoster virus can strike again, as chickenpox, not shingles.
chickenpox can spread over 2-3 weeks and depending on the person and age need not be itchy.
Photosensitive rash has been reported with acyclovir but is not common.
Possibly a short term allergic rash.
The chickenpox rash typically lasts for 7-10 days. It would not be at all unusual for chickenpox to last more than a week. If you believe you are having an unusual course of chickenpox, you should contact your health care provider for advice specific to your situation.