How will emotional distress damages be proved?

Yes. Your lawyer can certainly use this and many other factors as evidence of your emotional distress.

Slandering colleagues: how to answer an email sent to me and my boss full with accusations against me

I'm sorry but I don't really see a legal question.

Are Rehab/Care centers for elderly required to call 911 when vital signs indicate potential problem.

First, i am very sorry for your loss. Rehab centers definitely have a responsibility to care for their patients and seek additional medical care...

Does a General Power of Attorney give the agent the right to give Power of Attorney to someone else?

No. That is not a power the agent has.

Is it legal for landlord of Single Family house require tenants to copay maintenance expenses, e.g. first $100 of any repair?

Yes that is an acceptable term for a Lease.

You need to hire a personal injury lawyer to investigate the available coverages and advise you.

I was in a vehicle accident and the other party was at fault. Can I get reimbursed for loss of valuation on a wrecked vehicle?

Yes you can definitely make a claim for diminished value.

Can I file suit for having an ectopic pregnancy after a tubal ligation?

More facts are needed in addition to a detailed review of your medical records. Consult a medical malpractice attorney.

Consult a medical malpractice lawyer to review your medical records and advise you. Sounds like you have a legitimate claim.

Am i held responsible for my dog biting my friends when their dog attacked first?

You should consult an attorney with more specific facts because you possibly bear at least some responsibility.