Yes it really took a toll on me at times. For a little background on myself...the first time I started studying for the LSAT was during summer of 2017 going into my 5th year of undergrad. I took a prep course with Princeton Review and my diagnostic was a 132. I was working full time at a Real Estate law firm as well so it was difficult to balance. I was bent on writing December of last year but was scoring in the 140s and told myself there was no way. Fast forward to April of 2018, I finished undergrad and started studying all over again while working full time and using 7 sage. Work was stressful and studying was stressful. It really got to me so I feel you there.
In terms of easing anxiety on test day, you're going to feel anxious but remind yourself it's just another test, no different than the previous. I wrote over 20 practice tests, plus countless hours of drilling, review and fool proofing. On test day I reminded myself of how hard I worked. Regardless of how much I may have struggled, I knew I tried and that brought me confidence because I knew I put in the time and effort. I remember actually getting hyped up the morning of because I spent so many months preparing and worrying, it was like seeing the light at the end of a tunnel. In September I ended up with a 150 and I was disappointed. I ended up seeing a tutor and drilled arguments like crazy, somewhat to the detriment of my other sections. I just wrote January and got a 158. Sure, it's not the best score, but it's a huge improvement from where I started and I'm proud because I know I put in the work. I started with a 132 cold diagnostic and fell 2 points short of a 160 on my second sitting, all while working a pretty stressful job. I could write June in anticipation of next cycle, but for me, I don't think a rewrite at this point is worth it for me mentally. My point is that there were many times I didn't think I could do it, but I pushed through the grind and eventually did it.
You have plenty of time from now until June. Like Providence said, you don't need a a crazy high LSAT score, maybe a 156+ and you should be fine. Go see a tutor, figure out what works for you. Practice a ton and don't give into this idea that you can't conquer the test on test day. Meditate, eat well and lift. Study hard and look at test day as a challenge you can overcome. You can do this.