im finally wanting to buy medication for tapeworm..advice on what meds from where please!!

im tired of hurting and being scard. i have what i think is tapeworm. i feel it all in my stomach and moves to my back and i think something is in my head as well bc i feel it stretch out. anyway im wanting to try medication i can buy online but im afraid of buying something totally wrong or something that really isnt what it says it is. what links have you been successful with and which medication...how much do i take for 5'3 98 lb female...28 years old. thanks soooo much!