I tend to experience a lot of side effects from medications. Should I try nerve blocks for my bilateral small fiber neuropathy leg pain?

Probably not. Nerve blocks may help if large nerve roots are inflamed or injured. Typically they are used for a person with back pain when there is bone fide pressure on a nerve. Even in these situations many people do not have significant (> 50%) or sustained (> 3 months) relief of pain. I agree that medications have some side effects. Active physical/mental activity can distract your brain from nerve pain.