I Use Warfarin For Several Years(blood Clots Problems-DVT).I Have Insomnia

I use warfarin for several years(blood clots problems-DVT).I have insomnia for years, steady back pain related to damaged spinal cord, sciatica,persistent inflammation and cramps in both legs for over one year, bad short memory. Eventually, I want to use liquid magnesium supplement.Still confused, which type of magnesium supplement will be the most practical and safe. Any other suggestions?
Thank you very much.
Edmund