I'm not a medical expert and I have no formal study in medicine or any kind of health education, but I do have some knowledge and personal experience dealing with things like this spiritually. Still since I'm not a medical expert I can't say I'm right about everything I'm writing about here.. My apologies if there are any mistakes.
Still I hope this can be of help and I did my research prior to writing.
Having an enlarged spleen happens when your spleen is overworking. The spleen filters the blood and removes harmful bacteria that have been captured by your immune system by filtering them out. It's primary function is keeping the blood fresh and clean and it also makes fresh blood cells (both red and white) for the body.
It's an extremely important organ and it will often grow larger when one is sick or when one has some kind of infection, because the spleen needs to work harder during those times since there is more bacteria that need to be filtered out of the blood. So in order to compensate for a higher work load the spleen enlarges, and can increase in size multiple times it's normal size.
That will cause pressure from within and can cause problems, but the problem is not the spleen obviously.. That's what doctors would like you to think.. But the real problem is what caused your spleen to enlarge.
You said you also felt pain in your lower back or spinal base? That could mean the kidneys might be hurting aswell, since they are located close to their, but don't take my word for it..
The spinal base is lower than the kidneys, so it might be unrelated and something completely different, however if it is caused by the kidneys then this is very likely connected to the same cause as what enlarged the spleen.
My guess is that you have imbalances in the purity of the blood. Meaning that you might be having a lot of tixins in your body which could be comming from food or drink or from the air.. If this is the case then your spleen, kidneys and liver and in general your lymphatic system will be working overtime to prevent your body from getting ill because of these toxins or chemical imbalances.
I used this routine in the past and it seems to help regarding the lymph system and in general feels pretty good. It works on increasing circulation throughout the body:
http://pinklotus.org/-%20KY%20Kriya%20f ... system.htm I'm not a 100% sure if that routine is without corrupt information though.. So if something in there doesn't feel right, then don't use it. The poses and movements are legit though, I have used them and they work in a positive way, or atleast I never expreienced anything negative when using them.
Meditating on the energy of the sun while sitting in the sun can be very helpful in healing the body.
Also when working with healing energy, it helps to know the cause of the problems you are having and then directing healing energy of the sun to the cause in order to root it out.
Also regarding asperin... I have personally had a lot of negative expriences with it. It doesn't seem to heal anything, instead just stops the symptoms from being noticed. ALso Asperin can cause headaches or pressure in the head, I have experienced that myself.
I recommend not using it if you can bear with the pain, because it's not a helpful substance for the body and the liver and kidneys will be extra strained to remove it from the body since it's actually a chemical that cannot be naturally disolved from the body.
Your own aura is many times more effective than some asperin and has no negative side effects. You can heal practically anything within a couple of days with a strong enough aura and a strong intent to heal whatever is wrong.