Warfarin Sodium and agony

I am 28 and just suffered a pulmonary embolism (P.E.), very unusual for someone my age. I went into the hospital three times before they found it. I had severe pain in my upper left back, shoulder blade and neck when I first went in and the doc told me I was just having muscle spasms...I played Division I basketball for 4 years and am now a coach...I told him it wasn't a muscle spasm, but he sent me home with Ibuprofin....The second time I went in, I had worse pain two days later and told him it wasn't going away that something was really wrong. They did lung ex-rays, MRI and didn't find anything. They did no ultrasound or CT...hmmm. The third time I went in, I had terrible pain in my right side as though someone was stabbing me in the side. Couldn't catch my breath and was in absolute agony.
Finally they did a CT and ultrasound and found it at 6:30am on a Monday evening. I am very lucky that the third time I was admitted into the ER after a week, that they did a CT that found the P.E. I very easily could have died.

I was on Yasmin birth control for a year, unusual for a clot to occur after taking birth control for that amount of time, so they are not sure if that caused it and are still uncertain of the cause for my P.E. Maybe a blood disorder that I have not yet been tested for.

At the beginning of my warfarin treatment, I didn't experience headaches. Now though, after about 3-4 weeks...I am experiencing headaches in the middle of my forehead that are driving me crazy. I'm wondering if it is stress from all that I have gone through...an extremely painful experience...or a side effect of the drug.

Also, pain in my legs have been a problem. They feel heavy, like carrying around lead and I don't feel like I have much energy. I don't have much of an appetite anymore either. I have always been extremely active, stay at a healthy weight and have wanted to eat meals! Not so much anymore.

I'm not a smoker, and eat healthy foods...This is all very uncharacteristic for me and I'm extremely frustrated. I understand that it will take a while for me to recover from all of this, and inpatience with the matter could be a problem causing stress.

If you have any feedback, please let me know.