Trying to conceive is really exhausting, Am I the only one that feel this way?

Me and My Hubby have been trying to get pregnant for the last 5 months (we already have a 5 year old) and its very exhausting, I'm really considering giving up for good this time!!! I've been to the doctor a multiple times. I missed a period for 3 months straight and all of a sudden I start having periods again! Now they really irregular and my last cycle I just had I didn't have none of my normal signs I have when I come on I didn't even have cramps which makes me really confused, and now since I been off I'm cramping and having a lot of sharp pain in my abdomen and pelvic area

Any advice???????