Ignition is usually the easiest of the three to check because on most engines, all you have to do is pull off a plug wire and check for spark when the engine is cranked. On coil-over-plug DIS systems, there are no plug wires so you have to remove a coil and use a plug wire or adapter to check for a spark.
Stress can affect every part of your body. muscle aches, head aches, how your hair grows, the texture of your skin, it can affect your menstrual cycle.
Stress can affect your blood sugar. Excess stress causes your body to release a hormone called cortisol, which can raise your blood sugar. Cortisol and Stress: How to Stay Healthy: Cortisol is the stress hormone, and it has effects on blood sugar and how our bodies use nutrients.