First off: great choice to quit smoking. It takes plenty of willpower and patience to quit, but it will be worth it long-term.
Having quit now for 9 months and gone through what I would consider severe withdrawals (comparing experiences on here), the best advice I can give to you and anyone just starting on this path is be patient and be VERY kind to your body and mind. As experiences have shown (mine included), you will/may go through the acute phase of withdrawals for about 5-15 days, depending on your mind, body, time of use and quantity of use. I'm assuming this is where you are now.
I can speak from my experience. During this phase, I had severe anxiety, adrenaline rushes, close to full-blown panic attacks, unexplainable fears, no appetite (nearly 3 days without eating), shakes, tremors, nausea, depression, hopelessness and no energy. This was met with night sweats, vivid dreams and horrible insomnia. I would sleep for 1-2 hours and wake for 6 hours with my heart and mind racing. During this time, I had no idea what was going on later learning that it was indeed withdrawals. I would spend every waking moment on this forum and another trying to find comfort in others experiences and hope to guide me through the hell I was enduring. My best advice for you would be to be as patient as you can be and when your body and brain are re-correcting, do as little as possible if you can. Drink plenty of water and if you have an appetite, try to eat healthier meals filled with protein and good fats. As time goes on, I would try to incorporate some light exercise into your daily routine, but hold off on this until your acute withdrawals have passed. Exercise has helped me greatly during this quest.
Depending on how your next month or so goes, you may experience Post Acute Withdrawal Syndrome or PAWS. This will come in waves and may last 1-2 years. It will consist of some of the symptoms you experienced during the acute phase, typically depression, anxiety, derealization, and some others, but at a lesser extent. At 9 months, most of my symptoms have disappeared, although I have developed a minor form of Panic Disorder which I am currently seeing a therapist for. Some anxiety still lingers.
Just know that you WILL get through this.