1>May I exit and reenter USA while my H1B amendment is pending? do you see any problem while going for stamping?
I see that you will need H-1B visa stamping. I see that most H-1B visa stamping cases in India are placed into Administrative Processing that can take weeks or more with no guarantee of stamping and I see that because you have an amendment pending, your case is more likely to be placed in Administrative Processing and they will probably make you wait until the amendment is approved before they stamp you and that could take months. So yes, I see a problem with you getting stuck outside for at least a few weeks or months.
2>As premium processing is stopped as of now then is it possible to upgrade case from normal to premium processing and if answer is yes then how would it be beneficial at this time for my case?
It will be possible AFTER they start Premium Processing up again. At this point, no one know when that will be.
3> May I transfer my h1b to some other employer, while my h1b amendment is pending? do you see any problem then please share.
Yes, you may transfer your current H-1B to a new employer without worrying about the amendment as long as the H-1B transfer is filed BEFORE your current I-94 expires.
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