Have your doctor draft a letter explaining the cause of your asthma attacks and requesting a reasonable accommodation from your employer.

Being withheld from moving into another position due to understaffed situation

It does not sound fair, but may be legal depending on the circumstances. Do you have a union you are able to speak to about this?

I believe you will receive more answers to this question once the attorney above re-classifies it. It is an immigration question rather than a...

Can I quit my job with a dubious contract without legal ramifications?

If you have an employment contract, an attorney would need to review it for you before s/he could advise you of any legal ramifications.

What can I do about lost time

You may want to bring a copy of the letter in which they inform you of that along with your CBA to a local employment attorney.

How can I fix this

Did they let you go because you failed to disclose something or because of a specific charge?

Is verbal assault without threats still assault ?

It does not sound as though they made you physically afraid at any point.

My employer is not paying the shift differential that was part of accepting my position.

Is there a union involved that could intercede on your behalf?

How do I go about bringing a law suit against National Grid power company?

Unfortunately, I think Avvo may have mis-classified your question as this does not appear to be an employment law issue.

Do we need to shut down or take another company to court over the name of our company?

I would hire a local attorney, this should be a relatively simple matter to put to bed if there is no confusion.