You need to be testing at home when any side effects happen like nausea, sweating, confusion, etc appear or last a long time.

Did they instruct you how to monitor yourself at home?
Anyone on insulin injections needs to monitor at home often, especially when first adjusting to insulin.

As time passes you can then tie your side effects to your readings.
This is monitoring is very important... as the side effects of too high or too low can appear and feel similar. You need facts to make the correct determination on insulin dosing.

If you are type II you can possibly avoid insulin use, if you monitor your food well. In any event you have to become your own physician when you are diabetic. Some borderline diabetics in a hospital show elevated sugars due to the stress of surgeries etc. Then when home they return to enough normal to only need oral agents like Metformin or others. They will then become hypoglycemic at home on doses of injected insulin that were used in the hospital.

So the bottom line is for you to immediately contact your doctor and perhaps get into educational patient classes to help you out and adjust to everything.