ROFL- Sorry to hear about your issues. It is never easy to deal with taking care of your parents at this stage of their lives, and take care of yourself, your family and work. I am sure Hornian (or whatever he calls himself on Surly) can help you with the POA. But if you are interested, there are forms online if you need to save money or need something done quickly. The TMA has forms online you can us for a medical power of attorney: https://www.texmed.org/Template.aspx?id=65#MPOA.
Other than medical issues, there are financial issues to consider as well. You may also look to have your mother sign a durable power of attorney while she is capable, which would give you the ability to handle her finances. https://hhs.texas.gov/laws-regulations/forms/miscellaneous/sdpoa-statutory-durable-power-attorney
If she lacks mental capacity, then you would need court approval. But if she can sign off on the durable POA, you can start helping control her finances. It will not stop her from doing what she wants with her money, though. To do that, you would need court approval to be appointed Guardian of her Estate.