II made a mistake on my tax return last year. I forgot to file the cash income that I made. Can I fix it now?

Once a mistake is discovered, a taxpayer is required to amend the return within a reasonable time. Good luck.

Do i pay the amount shown on the letter that says there's a deficiency(increase)?

Sorry about the confusion. They use the terms refund when you are owed and tax liability when you owe. Most likely, deficiency is what you owe....

Would I get compensated for tax service giving my soon to be ex husband my filed 2017 taxes?

Why would estranged husband get a copy of your separate tax return? Legally he cannot do anything with your separate refund. Good luck.

Can I buy back my stocks to avoid support payments being based on capital gains? What is the time frame? How do I document it?

Sorry, you cannot avoid taxes by repurchasing the stock. Consult a local tax attorney with more details. Good luck

Have someone wire transfer the money without going there. The recipient of foreign gift is required to file with the IRS if the gift exceeds $100K....

Based on your facts, that search doesn't seem to be from the IRS. Maybe a Scam. Consult a tax attorney to confirm it with the IRS. Good luck.

Can I be charged?

It sounds a scam, but you should consult your lawyer. Good luck.

Can my son help me to co sponsor

This is a serious matter and you're better off consulting with an immigration attorney privately. Good luck.

How do I get a Letter of Testamentary in CA for my dear departed mom who was on MediCal & whose only assets were SSI?

A small estate affidavit should take care of it, as the counselor stated. Good luck.

How can I help my friend being falsely accused of elder abuse

Call the local bar association for a probona counsel of he cannot afford one. Good luck.