Sciatica Pain relief ?

So i don’t have a heating pad as of right now but I’m wondering if it actually helps for sciatica back pain? I don’t want to buy one if it won’t help much. My back pain also makes my hip numb and my knee cap very sore and the tops of my toes sore on my right side. I’m only 22 weeks so I still have a ways to go but I need to know what helps and what doesn’t... I’m not big into taking medicine if it’s not necessary so I haven’t tried Tylenol yet and would prefer to find a better solution first. Thanks in advance ladies!