Yes these could be the side effects of pregabalin. Usually the side effects reduce within 6 weeks.
Next Steps
If the side effects do not reduce you could try two things. You could reduce the dose to 50 mg. Pregabalin 50 mg is available. Or otherwise try taking the pregabalin at an earlier time at night.. around 8 or 9 pm if you have dinner late, or immediately after dinner if your dinner is early. This will reduce the feeling of light headedness in the morning.
Health Tips
If you still don't feel better please consult your doctor once again because there are other drugs apart from pregabalin available which might suit you better.