You have raised two issues. The first is quite simple - your attorney could not have settled your personal injury case without your knowledge or authorization. You should have been consulted during the negotiations and/or explained the status of your case. Second, with respect to the value of your case, you must keep in mind that - irrespective of the severity of your injuries - what you can recover is limited by a variety of external factors, such as the limits of tortfeasor's liability...
It may be as simple as filling out a new POA form and having your brother sign an acknowledgement that the earlier POA is no longer valid. However, I would also recommend contacting the local bar association to get in touch with an attorney, who specializes in elder law and trust/estate matters.
In Pennsylvania, you have four years from the date an agreement is breached to sue. It appears to me, however, that you have already filed suit and your issue is service of the complaint. I agree with the other attorney - hiring a seasoned collections attorney will help.
Agree with earlier responses, but wanted to let you know that, while you are correct that a statute of limitation in Pennsylvania for a breach of contract claim is only four years, there are states where it is much longer (e.g., South Dakota is 6 years and Rhode Island is 10 years). Therefore, if your credit card agreement is governed by the law of a jurisdiction with a longer statute of limitation, the creditor/collector may be within their contractual rights.
Depending on the number of employees involved, this may be either a class action or a "collective" action under the federal and/or state "wage/hour" statute. These types of matters are somewhat complex and I would highly recommend that you contact an attorney immediately to determine if you have a claim, as well as what should be done about it.
You can certainly win a property at the sheriff's sale. However, you will need to outbid the so-called "upset price" -- the amount owed to the bank that is forcing the sale, as well as all other bidders.