I'm unable to pinpoint when Lipitor's side effects began for you, as I don't have access to personal health information. However, I can provide some general information about Lipitor and its potential side effects based on publicly available data.

Lipitor (atorvastatin) is a prescription drug used to treat high cholesterol and reduce the risk of stroke, heart attack, and other heart complications. It belongs to a class of drugs called statins, which work by blocking a substance your body needs to make cholesterol.

Common side effects of Lipitor include:
- Muscle pain
- Liver problems
- Digestive issues
- Increased blood sugar levels
- Cold-like symptoms
- Joint pain
- Kidney problems
- Drowsiness
- Dizziness
- Numbness or tingling in the hands and feet

Serious side effects of Lipitor include:
- Muscle damage (rhabdomyolysis)
- Liver damage
- Kidney damage

It is essential to consult a healthcare professional if experiencing any side effects while taking Lipitor.

The FDA approved Lipitor in December 1996, and the drug's patent expired in November 2011. Since then, generic versions of atorvastatin have been available on the market.

Sources:
[1](https://www.webmd.com/cholesterol-management/lipitor-atorvastatin)
[2](https://www.drugs.com/lipitor.html)
[3](https://www.drugpatentwatch.com/drugs/lipitor)
[4](https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/lipitor-atorvastatin-calcium-what-you-need-know)