Medications to increase sperm count
are quite strong so doctors while prescribing these medicines generally advice a high protein and nutritious diet. You may have to take the medicines for quite sometime for good results. The symptoms you talked about can be considered as side-effects of the medicines, though some also complain of dizziness
and weakness, not all people suffer from such symptoms. However, you need not worry. Stay cool but improve on your diet. Include a lot of nuts, dairy products, legumes, cereals, fruits, eggs, green veggies and non-vegetarian food.
When you feel better and decide to start taking the medicines or their substitutes again make sure you are taking sufficient anti-oxidants, minerals, fiber and nutritional contents, juice and sufficient amount of water to help your medicine get metabolized better and absorbed well to give great results. Exercise regularly to keep fit.
You are fine, your symptoms are temporary and likely to go away with the medicines prescribed.