Varicose veins get always worse after exercise?

A proper evaluation and vein treatment will only help your cause and would be very helpful in making a treatment plan.   Assuming your varicose veins are bulging and cause some pain or other symptoms, a laser ablation, radiofrequency ablation, Venaseal, Clarivein, phlebectomy and/or foam sclerotherapy  would be a possible solutions.   A comprehensive vein treatment center should be able to offer you most if not all of these options and discuss intelligently the advantages and disadvantages of each with you.   Your varicose vein are presumably refluxing, causing blood to flow up and down, instead of one direction.   Having the diseased "feeding" vein(s) ablated will cause minimal to no down time, and it certainly shouldn’t discourage you from exercising and most patients experience long term or even permanent results.  I would suggest getting a thorough venous reflux ultrasound Doppler exam in the STANDING position in a dedicated "vein treatment" facility in order to get the best results.

Veins and arteries dilate, or get engorged when body temperature increases. When body temperature increases during exercise, the veins dilate, called venodilation. If you have varicose veins, they will become more prominent after exercise or if you shower using warm water or at the end of the day. Varicose veins should be treated if you have symptoms: aching, pain, heavy legs, tired legs, itching over the veins, cramping of the legs, throbbing of the veins, and ankle or leg swelling.Read the free ebook on the link below. If you want to take supplements to keep your veins healthy, we recommend a bioflavonoid product called Varicosamin from VenaSmart.com 

Thank you for the question! Varicose veins will develop when the vein valves malfunction and excess pressure forces the blood to flow backward. Like all veins, they will appear larger during exercise due to increased blood flow. You have a range of treatment options available to treat varicose veins. These include endovenous laser ablation, sclerotherapy, microphlebectomy, and clarivein treatment. In order to determine the right treatment option, you'd have to schedule an in-person consultation with a vein specialist. 
An in-person exam with a board-certified plastic surgeon is the best way to assess your needs and obtain expert medical advice. Best of luck!