I have almost all the symptoms for sle but I was negative in ana, and normal in esr. Is it possible that I could still have sle?

Not likely. Anything is possible, but it would be very very unlikely.
Probably not. The symptoms of lupus can also be seen in other diseases so i would suggest a rheumatology consult. A normal ESR makes the presence of a chronic inflammatory disease like lupus less likely. A negative ana, however, is seen in about 5% of lupus cases.
No. I'll take this a step farther and say no to lupus as a cause. ANA positivity is a requisite. The problem with lupus is that the symptoms can be seen in numerous other conditions, and consequently do not specifically identify lupus as the diagnosis.