FWIW, I've been in chronic pain since I was 10 (I'm now 33), on and off various pain medications and muscle relaxers for most of that time, and now nursing my 3rd son who is 6wks old after nursing my elder two until they were each about 30mo. (phdinparenting.com)
Medications such as muscles relaxers and Botox can help minimize pain and muscle problems. (cochrannation.com)
Valerian can cause sedation, so care should be taken when used with other sedating medications like muscle relaxers, pain medications, antidepressants, etc... (integrativemedicine.arizona.edu)