@SkyHighMig25 I must agree with @GinnyWeasley on this one, you do indeed have an uphill battle ahead of you. However, you miss all shots you don't take, so get that secondary in ASAP and hope for the best!
Also, the MCAT averages at TX schools aren't as high as in years past, so although a 501 is very low for MD schools, it might not hold you back as much as you might think. Attached I have links that show the average MCAT scores at a few TX schools that have released them.
http://elpaso.ttuhsc.edu/som/admissions/plfsom_stats_ey_2009.aspx
http://www.utsouthwestern.edu/education/medical-school/admissions/our-students.html
https://www.bcm.edu/education/schools/medical-school/admissions/faqs
Look at the average MCAT 2015 score vs. the old MCAT score. There's quite a difference in the matriculant scores. You can verify the percentiles yourself using efle's conversion tables.
EDIT: TTUHSC also seems to be a very mission focused school, so if your EC's are in line with their mission you have an even better shot!